Questions on Algebra: Equations answered by real tutors!

Tutors Answer Your Questions about Equations (FREE)

Question 193708: solve the equation
10x^2-2x=0
Click here to see answer by RAY100(1637)

Question 193714: I am having trouble solving for x.
.07 + 3x - 4.2 = 9x + 3.6 - 7x
The chapter did not cover more than one x so I am confused about equaling out the sides. I simplify it and get an answer of 6.5 * x = 5.6 * x I am sure that I am very wrong! Thank you for your help!
Click here to see answer by Mathtut(3670)

Question 193773: Create a real-life situation that fits into the equation (x + 3)(x - 5) = 0 and express the situation as the same equation.
Click here to see answer by Mathtut(3670)

Question 193772: What type of solution do you get for quadratic equations where D < 0? Give reasons for your answer. Also provide an example of such a quadratic equation and find the solution of the equation.
Click here to see answer by Alan3354(30982)

Question 193774: I have tried this equation numerous times.. but I can't seem to get the time. Here is the problem :
Find the time required for an investment of 5000 dollars to grow to 6400 dollars at an interest rate of 7.5 percent per year, compounded quarterly.
Here is what I have done:
6400=5000(1+(0.075/4))^4t
5000(1+(0.075/4))^4t=6400
5000(1+.01875)^4t=6400
5000/5000(1.01875)^4t=6400/5000
(1.01875)^4t=1.28
4t*ln(1.01875)=ln(1.28)
t=ln(1.28)/4*ln(1.01875)
Click here to see answer by Alan3354(30982)

Question 193789: Hello,
I have a problem with the following exponential equation, each time I try to solve it, I keep getting the wrong answer, could you look at my work and see what I am doing wrong? Thank you in advance.
Problem : 2^2x+4=3^x-21

This is what I have done so far :
ln(2)^2x+4=ln(3)^x-21
(2x+4)ln(2)= (x-21)ln(3)
2x*ln(2)+4*ln(2)=x*ln(3)-21*ln(3)
2x*ln(2)+x*ln(3)= -4*ln(2)-21*ln(3)
x(ln(3)+2*ln(2))=4*ln(2)-21*ln(3)
x= 4*ln(2)-21*ln(3)/ln(3)+2*ln(2)
Click here to see answer by RAY100(1637)

Question 193807: please multiply this equation

(a+3)(2a-7)

thank you.
Click here to see answer by RAY100(1637)

Question 193642: I dont understand how to find the time required for an investment
Problem:
Find the time required for an investment of 5000 dollars to grow to 6400 dollars at an interest rate of 7.5 percent per year, compounded quarterly.
I used the compound interest formula A=P(1+(r/n))^nt but I have no idea how to get the time. Could someone please help?
Click here to see answer by ankor@dixie-net.com(15634)

Question 193822: please multiply this equation

(4m^2n)(3mn^4)^2

thank you
Click here to see answer by solver91311(16868)

Question 193828: please "multiply" this out.

(4m^2n)(3mn^4)^2

thanks
Click here to see answer by Mathtut(3670)

Question 193846: please "multiply" this out.

(5x+3)^2

thank you
Click here to see answer by solver91311(16868)

Question 193847: Please "simplify" this problem.

-2a^3b(5a^2b^3)^2

thank you
Click here to see answer by Mathtut(3670)

Question 193862: please "simplify"

-24x^4y^3 over

16x^5y

thanks
Click here to see answer by Mathtut(3670)

Question 193907: please "simplify" the problem.

2a(3a^2+5a-6)+5(3a+7)

thank you
Click here to see answer by RAY100(1637)

Question 193906: please "simplify" this problem.

3m^6 over 6m^6

thanks
Click here to see answer by RAY100(1637)

Question 193917: please "simplify" this problem.

(7x^2-4x+3)-(5x^2+3x-8)

thank you
Click here to see answer by RAY100(1637)

Question 193946: "multiply and simplify please"

(2a-7)(3a+5)

thank you
Click here to see answer by Mathtut(3670)

Question 193949: Determine the type (real or complex) and number of the solutions of each of the following equations. Justify your answer.
x^2 + 3x - 15 = 0 Thank you
Click here to see answer by jim_thompson5910(28503)

Question 194030: please "multiply and simplify"

(5x-3)(5x+3)

thanks
Click here to see answer by jim_thompson5910(28503)

Question 194041: i need to multiply and simplify this problem.

(2x+4)(2x+4)

thank youu
Click here to see answer by jim_thompson5910(28503)

Question 194045: please multiply and simplify

(4a-5)(2a^2+a-4)

thanks
Click here to see answer by RAY100(1637)

Question 194045: please multiply and simplify

(4a-5)(2a^2+a-4)

thanks
Click here to see answer by Alan3354(30982)

Question 194069: 'solve each equation' please. (:
3n^2+6=11n
Click here to see answer by jim_thompson5910(28503)

Question 194077: Solve for a factor of 3x^3 + 7x^2 - x + 15
... is (x-3) a factor of this?
Click here to see answer by stanbon(57239)

Question 194086: what do you do if the equation is doesn't have one thing the other one does example : 2a- 5 = 3a
Click here to see answer by jim_thompson5910(28503)

Question 194071: 8-3+x=11
Click here to see answer by jim_thompson5910(28503)

Question 194072: 3x=9
Click here to see answer by jim_thompson5910(28503)

Question 194080: If P(x) = 3x^5 - 8x^4 + 3x^3 + 2x^2 - 16x + 14, then P(3) = ?
...is it 682?

Click here to see answer by Edwin McCravy(8881)

Question 194080: If P(x) = 3x^5 - 8x^4 + 3x^3 + 2x^2 - 16x + 14, then P(3) = ?
...is it 682?

Click here to see answer by jim_thompson5910(28503)

Question 194087: please multiply and simplify

5x^2(3x^2+2x-5)

thanks
Click here to see answer by edjones(7569)

Question 194095: Find each sum or difference
2x over x-2 minus x over 2-x
Click here to see answer by edjones(7569)

Question 194126: What type of solutions do you get from a quadratic equation where D < 0? Give reasons for your answer. Also provide an example of such a quadratic equation and find the solutions of the equation. Thank You
Click here to see answer by Mathtut(3670)

Question 194125: Determine the type (real or complex) and number of the solutions of each of the following equations. Justify your answer.
x^2 + x + 4 = 0 Thank You

Click here to see answer by Mathtut(3670)

Question 194133: please "multiply and "simplify" this problem

5x^2(3x^2+2x-5)

thank you
Click here to see answer by Mathtut(3670)

Question 194179: Determine the number of solutions and classify the type of solutions for each of the following equations. Justify your answer.
4x2 + 16x + 16 = 0
Click here to see answer by RAY100(1637)

Question 194177: Determine the number of solutions and classify the type of solutions for each of the following equations. Justify your answer.
x2 – 4x - 77 = 0
Click here to see answer by RAY100(1637)

Question 194292: 27 7/3 over 27 8/3=
1/27
Did I figure this out right?
Click here to see answer by checkley77(12569)

Question 194291: 1/6d^5 + 1/7d^9=
6+7d4/42d^14
Did I answer correctly?
Click here to see answer by Earlsdon(6287)

Question 194320: What is the equation of a circle with center(-2,5) and radius 3?
Click here to see answer by user_dude2008(1861)

Question 194423: -2p+8=6-(5p+2)
Click here to see answer by jim_thompson5910(28503)

Question 194468: Pre Algebra Chapter 3 Resource Book.
McDougal Littell
Lesson 3.1 Practice B
for use with pages 119-124
1.6x -7=17;x=4 Having trouble solving probem. Don't understand
Lesson 3.2 Practice B
for use with pages 125-129
1. 10-3(x+2)=31 Do not have foundation down. Having trouble solving problem.
Click here to see answer by jim_thompson5910(28503)

Question 194538: Find the sum of all positive odd integers less than 300.
Click here to see answer by edjones(7569)

Question 194544: A garden's length is five times its width. Write an expression for the number of sections of 10 foot fence that are needed for this garden.
Click here to see answer by RAY100(1637)

Question 194495: Write an expression for the following (use x for the unknown number): 2 more than 3 times an unknown number is equal to one half of the difference between the unknown number and ten.
Click here to see answer by ejazali_syed(7)

Question 194634: you need to express the problem as an exponential function whose value is the percentage of the remaining thorium after x million years, and then use the function and the following two properties to find the age of meteorite in million years:
The level of thorium in a sample decreases by a factor of one-half every 2 million years. A meteorite is discovered to have only 8.6% of its original thorium remaining. How old is the meteorite? Thank you
Click here to see answer by stanbon(57239)

Older solutions: 1..45, 46..90, 91..135, 136..180, 181..225, 226..270, 271..315, 316..360, 361..405, 406..450, 451..495, 496..540, 541..585, 586..630, 631..675, 676..720, 721..765, 766..810, 811..855, 856..900, 901..945, 946..990, 991..1035, 1036..1080, 1081..1125, 1126..1170, 1171..1215, 1216..1260, 1261..1305, 1306..1350, 1351..1395, 1396..1440, 1441..1485, 1486..1530, 1531..1575, 1576..1620, 1621..1665, 1666..1710, 1711..1755, 1756..1800, 1801..1845, 1846..1890, 1891..1935, 1936..1980, 1981..2025, 2026..2070, 2071..2115, 2116..2160, 2161..2205, 2206..2250, 2251..2295, 2296..2340, 2341..2385, 2386..2430, 2431..2475, 2476..2520, 2521..2565, 2566..2610, 2611..2655, 2656..2700, 2701..2745, 2746..2790, 2791..2835, 2836..2880, 2881..2925, 2926..2970, 2971..3015, 3016..3060, 3061..3105, 3106..3150, 3151..3195, 3196..3240, 3241..3285, 3286..3330, 3331..3375, 3376..3420, 3421..3465, 3466..3510, 3511..3555, 3556..3600, 3601..3645, 3646..3690, 3691..3735, 3736..3780, 3781..3825, 3826..3870, 3871..3915, 3916..3960, 3961..4005, 4006..4050, 4051..4095, 4096..4140, 4141..4185, 4186..4230, 4231..4275, 4276..4320, 4321..4365, 4366..4410, 4411..4455, 4456..4500, 4501..4545, 4546..4590, 4591..4635, 4636..4680, 4681..4725, 4726..4770, 4771..4815, 4816..4860, 4861..4905, 4906..4950, 4951..4995, 4996..5040, 5041..5085, 5086..5130, 5131..5175, 5176..5220, 5221..5265, 5266..5310, 5311..5355, 5356..5400, 5401..5445, 5446..5490, 5491..5535, 5536..5580, 5581..5625, 5626..5670, 5671..5715, 5716..5760, 5761..5805, 5806..5850, 5851..5895, 5896..5940, 5941..5985, 5986..6030, 6031..6075, 6076..6120, 6121..6165, 6166..6210, 6211..6255, 6256..6300, 6301..6345, 6346..6390, 6391..6435, 6436..6480, 6481..6525, 6526..6570, 6571..6615, 6616..6660, 6661..6705, 6706..6750, 6751..6795, 6796..6840, 6841..6885, 6886..6930, 6931..6975, 6976..7020, 7021..7065, 7066..7110, 7111..7155, 7156..7200, 7201..7245, 7246..7290, 7291..7335, 7336..7380, 7381..7425, 7426..7470, 7471..7515, 7516..7560, 7561..7605, 7606..7650, 7651..7695, 7696..7740, 7741..7785, 7786..7830, 7831..7875, 7876..7920, 7921..7965, 7966..8010, 8011..8055, 8056..8100, 8101..8145, 8146..8190, 8191..8235, 8236..8280, 8281..8325, 8326..8370, 8371..8415, 8416..8460, 8461..8505, 8506..8550, 8551..8595, 8596..8640, 8641..8685, 8686..8730, 8731..8775, 8776..8820, 8821..8865, 8866..8910, 8911..8955, 8956..9000, 9001..9045, 9046..9090, 9091..9135, 9136..9180, 9181..9225, 9226..9270, 9271..9315, 9316..9360, 9361..9405, 9406..9450, 9451..9495, 9496..9540, 9541..9585, 9586..9630, 9631..9675, 9676..9720, 9721..9765, 9766..9810, 9811..9855, 9856..9900, 9901..9945, 9946..9990, 9991..10035, 10036..10080, 10081..10125, 10126..10170, 10171..10215, 10216..10260, 10261..10305, 10306..10350, 10351..10395, 10396..10440, 10441..10485, 10486..10530, 10531..10575, 10576..10620, 10621..10665, 10666..10710, 10711..10755, 10756..10800, 10801..10845, 10846..10890, 10891..10935, 10936..10980, 10981..11025, 11026..11070, 11071..11115, 11116..11160, 11161..11205, 11206..11250, 11251..11295, 11296..11340, 11341..11385, 11386..11430, 11431..11475, 11476..11520, 11521..11565, 11566..11610, 11611..11655, 11656..11700, 11701..11745, 11746..11790, 11791..11835, 11836..11880, 11881..11925, 11926..11970, 11971..12015, 12016..12060, 12061..12105, 12106..12150, 12151..12195, 12196..12240, 12241..12285, 12286..12330, 12331..12375, 12376..12420, 12421..12465, 12466..12510, 12511..12555, 12556..12600, 12601..12645, 12646..12690, 12691..12735, 12736..12780, 12781..12825, 12826..12870, 12871..12915, 12916..12960, 12961..13005, 13006..13050, 13051..13095, 13096..13140, 13141..13185, 13186..13230, 13231..13275, 13276..13320, 13321..13365, 13366..13410, 13411..13455, 13456..13500, 13501..13545, 13546..13590, 13591..13635, 13636..13680, 13681..13725, 13726..13770, 13771..13815, 13816..13860, 13861..13905, 13906..13950, 13951..13995, 13996..14040, 14041..14085, 14086..14130, 14131..14175, 14176..14220, 14221..14265, 14266..14310, 14311..14355, 14356..14400, 14401..14445, 14446..14490, 14491..14535, 14536..14580, 14581..14625, 14626..14670, 14671..14715, 14716..14760, 14761..14805, 14806..14850, 14851..14895, 14896..14940, 14941..14985, 14986..15030, 15031..15075, 15076..15120, 15121..15165, 15166..15210, 15211..15255, 15256..15300, 15301..15345, 15346..15390, 15391..15435, 15436..15480, 15481..15525, 15526..15570, 15571..15615, 15616..15660, 15661..15705, 15706..15750, 15751..15795, 15796..15840, 15841..15885, 15886..15930, 15931..15975, 15976..16020, 16021..16065, 16066..16110, 16111..16155, 16156..16200, 16201..16245, 16246..16290, 16291..16335, 16336..16380, 16381..16425, 16426..16470, 16471..16515, 16516..16560, 16561..16605, 16606..16650, 16651..16695, 16696..16740, 16741..16785, 16786..16830, 16831..16875, 16876..16920, 16921..16965, 16966..17010, 17011..17055, 17056..17100, 17101..17145, 17146..17190, 17191..17235, 17236..17280, 17281..17325, 17326..17370, 17371..17415, 17416..17460, 17461..17505, 17506..17550, 17551..17595, 17596..17640, 17641..17685, 17686..17730, 17731..17775, 17776..17820, 17821..17865, 17866..17910, 17911..17955, 17956..18000, 18001..18045, 18046..18090, 18091..18135, 18136..18180, 18181..18225, 18226..18270, 18271..18315, 18316..18360, 18361..18405, 18406..18450, 18451..18495, 18496..18540, 18541..18585, 18586..18630, 18631..18675, 18676..18720, 18721..18765, 18766..18810, 18811..18855, 18856..18900, 18901..18945, 18946..18990, 18991..19035, 19036..19080, 19081..19125, 19126..19170, 19171..19215, 19216..19260, 19261..19305, 19306..19350, 19351..19395, 19396..19440, 19441..19485, 19486..19530, 19531..19575, 19576..19620, 19621..19665, 19666..19710, 19711..19755, 19756..19800, 19801..19845, 19846..19890, 19891..19935, 19936..19980, 19981..20025, 20026..20070, 20071..20115, 20116..20160, 20161..20205, 20206..20250, 20251..20295, 20296..20340, 20341..20385, 20386..20430, 20431..20475, 20476..20520, 20521..20565, 20566..20610, 20611..20655, 20656..20700, 20701..20745, 20746..20790, 20791..20835, 20836..20880, 20881..20925, 20926..20970, 20971..21015, 21016..21060, 21061..21105, 21106..21150, 21151..21195, 21196..21240, 21241..21285, 21286..21330, 21331..21375, 21376..21420, 21421..21465, 21466..21510, 21511..21555, 21556..21600, 21601..21645, 21646..21690, 21691..21735, 21736..21780, 21781..21825, 21826..21870, 21871..21915, 21916..21960, 21961..22005, 22006..22050, 22051..22095, 22096..22140, 22141..22185, 22186..22230, 22231..22275, 22276..22320, 22321..22365, 22366..22410, 22411..22455, 22456..22500, 22501..22545, 22546..22590, 22591..22635, 22636..22680, 22681..22725, 22726..22770, 22771..22815, 22816..22860, 22861..22905, 22906..22950, 22951..22995, 22996..23040, 23041..23085, 23086..23130, 23131..23175, 23176..23220, 23221..23265, 23266..23310, 23311..23355, 23356..23400, 23401..23445, 23446..23490, 23491..23535, 23536..23580, 23581..23625, 23626..23670, 23671..23715, 23716..23760, 23761..23805, 23806..23850, 23851..23895, 23896..23940, 23941..23985, 23986..24030, 24031..24075, 24076..24120, 24121..24165, 24166..24210, 24211..24255, 24256..24300, 24301..24345, 24346..24390, 24391..24435, 24436..24480, 24481..24525, 24526..24570, 24571..24615, 24616..24660, 24661..24705, 24706..24750, 24751..24795, 24796..24840, 24841..24885, 24886..24930, 24931..24975, 24976..25020, 25021..25065, 25066..25110, 25111..25155, 25156..25200, 25201..25245, 25246..25290, 25291..25335, 25336..25380, 25381..25425, 25426..25470, 25471..25515, 25516..25560, 25561..25605, 25606..25650, 25651..25695, 25696..25740