Questions on Algebra: Quadratic Equation answered by real tutors!

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Question 417035: Justin is 4 years older than Ethan. In 9 years the sum of their ages will be 30. Find the age of each boy now.
Justin is ? years
Ethan is ? years
Click here to see answer by checkley79(3050)

Question 417052: Ok so in algebra today we learned like 2 days ago the QUADRATIC FORMULA...well i just dont understand how to solve it. for ex.

I dont understand how to do the steps to get the answer
so i do x=-4+/-=sqrt (4)^2-4(3)(-8)
then x= +/-+sqrt 16-96/ 2x3
i dont know where to go from there.
Click here to see answer by checkley79(3050)

Question 417121: 2xsquared-3x-5=0
Click here to see answer by jim_thompson5910(28593)

Question 417121: 2xsquared-3x-5=0
Click here to see answer by stanbon(57308)

Question 417158: 2t^2-8t=0
Click here to see answer by edjones(7569)

Question 417008: what are the steps to solving quadratic equations?
Click here to see answer by richard1234(5390)

Question 417259: x^2-16x+51
Click here to see answer by edjones(7569)

Question 417324: I need help solving and graphing this equation:

and there are two solutions : 2 , 3
Graph

Click here to see answer by dnanos(83)

Question 417535: Find the x-intecepts of y=225-x^2

Click here to see answer by ewatrrr(10682)

Question 417333: I need help with this problem.

Solve for 2m=5
I got m=2.5 but the answers are all in fractions.
Help?
Click here to see answer by ankor@dixie-net.com(15649)

Question 417627: Two young boys, Bob and Tom, are mowing grass one summer as a means of making money to save for their college education. They always split the work and proceeds equally. They have one lawnmower. They obtain a new job which involves mowing a 40' by 80' rectangular vacant lot. The owner wants it mowed in a collapsing pattern (begin mowing around the outside perimeter, with each pass moving closer to the center of the lot). Bob will mow first, turning the work over to Tom when he has mowed exactly half the area. Bob decides that he will stop at a uniform distance in from the perimeter on all sides, leaving a remaining rectangle for Tom to complete. At what uniform distance (in feet to 2 decimal places) should Bob stop mowing? Solve by creating and solving a quadratic equation.

Click here to see answer by ankor@dixie-net.com(15649)

Question 417699: Pat is 28 years older than his son Patrick. In 8 years Pat will be twice as old as Patrick. How old are they now?
Patrick is ? years old
Pat is ? years old
Click here to see answer by robertb(4012)

Question 417696: The circumference of a circle is given by the formula C = 2πr. Find r if the circumference C is 176 meters and π is 22/7.
? meters
Click here to see answer by ewatrrr(10682)

Question 417935: a farmer has $2400 to spend to fence two rectangular pastures. the local contractor will build the fence at a cost of $6.25/m what is the largest total area that the farmer can have fenced for that price ?
Click here to see answer by rfer(12657)

Question 417974: Graph the horizontal line y = 8. (Do this on paper. Your instructor may ask you to turn in this graph.)
Name its intercept.
The (x or y) - intercept is ?
Choose either x or y
Click here to see answer by mananth(12270)

Question 417970: Graph the line that passes through the points (-3, -5) and (8, 6)?
What are the x- and the y-intercepts for this line?
x-intercept
a = ?
y-intercept
b = ?
Click here to see answer by mananth(12270)

Question 417965: Mike has $1.75 in dimes and nickels. If he has 5 more nickels than dimes, how many of each coin does he have?
? nickels
? dimes
Click here to see answer by algebrahouse.com(1079)

Question 417966: Kelly has a collection of nickels, dimes, and quarters with a total value of $7.30. There are five more nickels than dimes and twice as many quarters as nickels. How many of each coin is in her collection?
? nickels
? dimes
? quarters
Click here to see answer by mananth(12270)

Question 417978: I need sorry help with this problem: Find the perimeter
3c^2-+12c-8 left side of perimeter|_\ right side of perimeter 126^2-8c+9
c-5 this is the bottom of the perimeter
What is the perimeter
Please someone help. I have tried all day to figure this out. Sorry that I could not make a better perimeter.
Thank you for your help:)
KB
Click here to see answer by stanbon(57308)

Question 417964: Sue has $2.30 in dimes and nickels. If she has 11 more dimes than nickels, how many of each coin does she have?
? nickels
? dimes
Click here to see answer by mananth(12270)

Question 418019: Factor:72+22x-x²
Click here to see answer by shree840(260)

Question 418019: Factor:72+22x-x²
Click here to see answer by Edwin McCravy(8908)

Question 417969: Graph the line that passes through the points (-1, 3) and (9, -7)?
What are the x- and the y-intercepts for this line?
x-intercept
a = ?
y-intercept
b = ?
Click here to see answer by lwsshak3(6494)

Question 417961: Marissa has $4.70 in quarters and dimes. If she has 9 more quarters than dimes, how many of each coin does she have?
? dimes
? quarters
Click here to see answer by mananth(12270)

Question 417973: Graph the vertical line x = -2.
Name its intercept
The (x or y) - intercept is .
Choose either x or y
Click here to see answer by ewatrrr(10682)

Question 417960: The length of a rectangle is 7 inches more than three times the width. The perimeter is 86 inches. Find the length and width.
l = ? inches
w = ? inches
Click here to see answer by praseenakos@yahoo.com(507)

Question 417924: Graph the quadratic function. Indicate the vertex coordinates, the axis of symmetry line, the y-intercept, and x-intercepts.
y=2x^2-4x+1
Click here to see answer by ewatrrr(10682)

Question 418052: Please, I need help with this: Divide this polynomial:(15x^(3)-33x^(2)-61x-20)/(5x+4)=
Click here to see answer by sudhanshu_kmr(1152)

Question 418089: what is the equations of the axis of symmetry of the graph y=2x^2-6x-14
Click here to see answer by ewatrrr(10682)

Question 417959: One side of a triangle is half the longest side. The third side is 8 meters less than the longest side. The perimeter is 42 meters. Find all three sides. (Enter your answers from smallest to largest.)
? meters
? meters
? meters
Click here to see answer by ewatrrr(10682)

Question 417091: the graph of the quadratic y = -2x^2 + 3
the graph is translated down 4 units , what is the equation of the new function
Click here to see answer by ewatrrr(10682)

Question 418275: Solve for x and find the x-interceptors for 3x^2-7x-13=0

Click here to see answer by rfer(12657)

Question 418360: what is the solution set of the quadratic equation 8x2 + 2x + 1 = 0
Click here to see answer by MathLover1(6627)

Question 418439: x2-2x-13=0 i can not figure out how to figure this out
Click here to see answer by stanbon(57308)

Question 418439: x2-2x-13=0 i can not figure out how to figure this out
Click here to see answer by MathLover1(6627)

Question 418659: Find the x-intercepts and y-intercepts for f(x)
f(x)=x^2-9x+2
The x intercepts are?
THe y-intercepts are?
Click here to see answer by ewatrrr(10682)

Question 418733: One side of a triangle is half the longest side. The third side is 8 meters less than the longest side. The perimeter is 42 meters. Find all three sides. (Enter your answers from smallest to largest.)
? meters
? meters
? meters
Can you show me each step to get the answer?
Click here to see answer by ewatrrr(10682)

Question 418953: I was absent and my friends notes are off so I'm really confused. Your help would be greatly appreciated. Here are my instructions : Write the equation of the axis of symmetry, and find the coordinates of the vertex of the graph of each function. Idetify the vertex as a maximum or minimum. Then graph the function. The first ones are REALLY HARD. However, I'll give an easy one so I can see it all done so I can figure out the hard ones. The problem is :
y = 3x^2 - 6x + 4 . We are graphing quadratic functions. Thanks so much!
Click here to see answer by shree840(260)

Question 418983: Graph the line that passes through the points (-1, 3) and (9, -7)? (Do this on paper. Your instructor may ask you to turn in this graph.)
What are the x- and the y-intercepts for this line?
x-intercept
a = ?
y-intercept
b = ?
Click here to see answer by rfer(12657)

Question 418913: what number and its square differ by 20?
Click here to see answer by algebrahouse.com(1079)

Question 419010: Graph the following line. (Do this on paper. Your instructor may ask you to turn in this graph.)
y=1/4x+4
Name the slope and y-intercept by looking at the graph.
Slope
m = ?
y-intercept
b = ?
Click here to see answer by richard1234(5390)

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