Questions on Algebra: Quadratic Equation answered by real tutors!

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Question 630606: Hello
I have couple questions.
1) what is the exact values of x^2+4x-20=0
and how can I find it
2)a floor measures 12m by 8m. a rug covers one-third of the floor.the uncovered part of the floor forms a uniform strip around the rag . how wide is the strip ?
Thanks for helping
Click here to see answer by stanbon(57361)

Question 630611: what is the quadratic equation for the given solutions 7i and -7i
Click here to see answer by stanbon(57361)

Question 630634: Carlos trows a rock from the pier. The height of the rock h(t) can be moxled by the function. h(t)=-5t^2+13t+6. When will the rock hit the water ? What is the maximum height of the rock ?

Click here to see answer by stanbon(57361)

Question 630715: The student council of Sta. Luucia needed 2,250 for an annual trip. If 5 more members joined the group, each member would then save 5. How many students planned to make the trip?

Click here to see answer by lwsshak3(6509)

Question 630719: Solve for x/complete the square: 5x^2+2x√10=1?
Click here to see answer by jsmallt9(3296)

Question 630741: Use the "DIFFERENCE of SQUARES" rule to factor the following expression:
16x^4-121y^4

Tutors, I have no idea of where to start?

Click here to see answer by reviewermath(527)

Question 630716: The velocity of a blood corpuscle in a vessel depends on how far the corpuscle is from the center of the vessel. Let R be the constant radius of the vessel Vm, the constant maximum velocity of the corpuscle; r, the distance from a center to a particular blood corpuscle (variable); and Vr, the velocity of that corpuscle. The velocity Vr is related to the distance r
according to Vr=Vm(1-r2/R2). find f when Vr = 1/4 Vm
Click here to see answer by Alan3354(30993)

Question 630839: Solve the quadratic equation by using the definition of square root and write the solutions in radical form. Simplify the solutions.
4(y+5)^2=128

Answer:
y= ___ , ___
Click here to see answer by nerdybill(6961)

Question 630949: give solutions for (x-7)^2=18 give solutions not the decimals
Click here to see answer by stanbon(57361)

Question 630955: f(x)=-(x+5)^2-6 what is the vertex
Click here to see answer by reviewermath(527)

Question 630962: if discriminant is greater than 0,then two solutions are present.which one of the two solutions is preferable ? and why ?
Click here to see answer by Alan3354(30993)

Question 631032: Complete the square: y=4x^2+24x-13
Click here to see answer by ewatrrr(10682)

Question 631033: Rogelio and jin are looking up at the top of a tower that 36.6m tall. If jin is looking at an angle of elevation of 24 degrees, and rogelio is on the opposite side of the tower looking up at an angle of 17 degree, how far apart are rogelio and jin to the nearest meter? Assume their eyes are both 1.8m off the ground.
Click here to see answer by dfrazzetto(277)

Question 631195: determine the nature of the solutions of the equation
t^2-6t=0
A) 2 real solutions
B)1 real solution
C) 2 imaginary solution
Click here to see answer by solver91311(16897)

Question 631190: What does it mean to "describe what the solution(s) represent to the graph"?
For example, I had a equation and I solved it to ge the solutions x = -2 and x = -3. I put down the parabola opens upward since the "a" of the quadratic equation is positive. Is there more to this answer or am I correct?
Click here to see answer by solver91311(16897)

Question 631189: What does it mean to "describe what the solution(s) represent to the graph"?
For example, I had a equation and I solved it to ge the solutions x = -2 and x = -3. I put down the parabola opens upward since the "a" of the quadratic equation is positive. Is there more to this answer or am I correct?
Click here to see answer by solver91311(16897)

Question 631077: The exact x values of x^2+4x-20=0
Click here to see answer by jim_thompson5910(28595)

Question 631098: I have tried and tried on this problem and just cant get it right. I even had a tutor online help me and they got it wrong too... this is the problem ...
Solve the system of equations. Round approximate values to the nearest ten-thousandth.
y = log2x
y = x−5
Click here to see answer by richwmiller(9143)

Question 631393: if a+b+c=0 and a,b,c are rational then the roots of the equation (b+c-a)x²+(c+a-b)x+(a+b-c)=0 are
Click here to see answer by AnlytcPhil(1277)

Question 631402: if the equation (k2-3k+2)x2+(k2-5k+4)x+(k2-6k+5)=0 is an identity then the value of k is ?
Click here to see answer by solver91311(16897)

Question 631438: solve the following quadratic equaton for x
(2x+1)(x+3)=0
Click here to see answer by ewatrrr(10682)

Question 631492: please help: 25m^2=20m
Click here to see answer by Tatiana_Stebko(1326)

Question 631400: the number of positive integral solutions satisfying of x and y satisfying x4-y4=2007196 is
Click here to see answer by Edwin McCravy(8909)

Question 631338: Suppose ax^2+bx+c=0 is a quadratic equation which has real complex roots. Why should it have complex conjugate roots? [Hint: Think of how roots of a quadratic equation are derived using the quadratic formula]
(please help me with this)
Click here to see answer by richard1234(5390)

Question 631381: In vertex form, how will a, h and k help us in graphing a quadratic function?
Click here to see answer by richard1234(5390)

Question 631568: I need to find some examples of quadratic equations and their solutions?

Click here to see answer by Edwin McCravy(8909)

Question 631582: Amir pitched a baseball at an initial height of 5.9 feet with a velocity of 73.16 feet per second.
About how long will it take the ball Amir pitched to hit the ground?
A) 4.66 seconds
B) 2.94 seconds
C) 2.35 seconds
D) 1.47 seconds
Click here to see answer by Alan3354(30993)

Question 631668: Find the real zeros of the function P(x)=3(x+8)^2-(x+8)+4
Click here to see answer by lwsshak3(6509)

Question 631778: Amir pitched a baseball at an initial height of 5.9 feet with a velocity of 73.16 feet per second. About
how long will it take the ball Amir pitched to hit the ground?
a) 4.66 seconds
b) 2.94 seconds I assume he pitched the ball horizontally.
c) 2.35 seconds
d) 1.47 seconds
Click here to see answer by stanbon(57361)

Question 631777: a man spends Rs 5 on bar chocolates. had they been 2 and a half paisa, he would have bought 10 more. how many did he buy?
Click here to see answer by richwmiller(9143)

Question 631780: when the price of an orange is reduced by 50 paise, i find that by paying an extra Rs 3, i can buy 3 dozen instead of 2 and a half dozen. how much did an orange cost before the reduction in price?
Click here to see answer by richwmiller(9143)

Question 631890: Solve by Completing the Square:
2x^2 - 3x + 1 = 0

This problem is troubling me ! Thank you for your time and help !! I really appreciate it :) Please show work through steps so I have a thorough understanding. THank you so much !
Click here to see answer by ewatrrr(10682)

Question 631859: Solve for x. Enter your answer below as an improper fraction in lowest terms, using the slash ( / ) as the fraction bar.
Link to problem:
http://goo.gl/H6wId

Click here to see answer by Tatiana_Stebko(1326)

Question 631914: I dont know how to use this formula x= -b + or - the square root of b2 -4ac over 2a for this equation y= x2 -25
Click here to see answer by ankor@dixie-net.com(15656)

Question 631928: The measured dimensions of a rectangle are 8m by 4m to the nearest whole unit. Find the minumum and maximum possible areas of the rectangle
Click here to see answer by 55305(76)

Question 632126: Solve the inequality algebraically.
7x-6>=-3x^2
The solution set is __?
(Type your answer in interval notation. Use integers or fractions for any numbers in the expression. Simplify your answer.)
Click here to see answer by blacksaibot(4)

Question 632201: Can someone please help me with the first five questions to ind of give me a start on how to dothis assignment....Pleas and thank you in advance.

Suppose you are managing sales of tickets for a large concert venue. In order to anticipate staffing needs in the box office, you must gather information about projected ticket sales for an upcoming concert. The expected number of ticket sales for each day x is given by the following equation:
tickets=-5x^2+18x+9

PROBLEM SHOW YOUR SOLUTIONS HERE
1. Does the graph of this equation open up or down? How do you know?
2. Describe what happens to the ticket sales as time passes.
3. Use the quadratic formula to determine the last day that tickets will be sold.
Note: Write your answer in terms of the number of days after ticket sales begin.
4. Will ticket sales be at a peak or a low during the middle of the sale? How do you know?
5. After how many days will the peak or low (middle of the sale) occur?
6. How many tickets will be sold on the day when the peak or low (middle of the sale) occurs?
7. What is the point (ordered pair) of the vertex? How does this point relate to your answers to problems 5 and 6.
8. How many real solutions are there to the equation ? How do you know?
9. What do the solutions to the equation in #8 represent? Is there a solution that doesn’t make sense? If so, in what ways does the solution not make sense?
Click here to see answer by solver91311(16897)

Question 631740: 5x+4x2-8=2x(4+2x)
Click here to see answer by Tatiana_Stebko(1326)

Question 632250: How do you solve this quadratic equation?
x^2 − 16 = 0
Click here to see answer by richwmiller(9143)

Question 632274: i. f(x)=x^2-4x+4
ii. f(x)=3x^2-4x^2+2
Click here to see answer by reviewermath(527)

Question 632318: Solve for x. 2(x-4)-(x+2)=(x+2)(x-4)
Click here to see answer by reviewermath(527)

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