Questions on Algebra: Quadratic Equation answered by real tutors!

Tutors Answer Your Questions about Quadratic Equations (FREE) Get help from our free tutors ===> Algebra.Com stats: 2014 tutors, 419684 problems solved View all solved problems on Quadratic_Equations -- maybe yours has been solved already! Become a registered tutor (FREE) to answer students' questions. Click here to see problems AND answers on one page Question 253227: state all the values of k that would make the following have imaginary roots: x^2-9x+k=0 please show work Click here to see answer by richwmiller(9135)   Question 253264: What is the optimal value of this function: y=0.5x^2+2x+3 Click here to see answer by jim_thompson5910(28595)   Question 253261: Tim kicks a ball off the ground. After t seconds, its height, h (in feet), is given by the formula h + -16t^2 + 64t. What is the maximum height reached by the ball? Click here to see answer by Greenfinch(383)   Question 253267: What is the optimal value of this function: y=-0.5x^2+2x+3 Click here to see answer by jim_thompson5910(28595)   Question 253267: What is the optimal value of this function: y=-0.5x^2+2x+3 Click here to see answer by Alan3354(30993)   Question 253299: Which statement must be true if a parabola represented by the equation y = ax^2 + bx + c does not intersect the x-axis? b^2 – 4ac = 0 b^2 – 4ac < 0 b^2 – 4ac > 0, and b^2 – 4ac is a perfect square. b^2 – 4ac > 0, and b^2 – 4ac is not a perfect square Click here to see answer by drk(1908)   Question 253299: Which statement must be true if a parabola represented by the equation y = ax^2 + bx + c does not intersect the x-axis? b^2 – 4ac = 0 b^2 – 4ac < 0 b^2 – 4ac > 0, and b^2 – 4ac is a perfect square. b^2 – 4ac > 0, and b^2 – 4ac is not a perfect square Click here to see answer by Alan3354(30993)   Question 253299: Which statement must be true if a parabola represented by the equation y = ax^2 + bx + c does not intersect the x-axis? b^2 – 4ac = 0 b^2 – 4ac < 0 b^2 – 4ac > 0, and b^2 – 4ac is a perfect square. b^2 – 4ac > 0, and b^2 – 4ac is not a perfect square Click here to see answer by JimboP1977(308)   Question 253326: How do you complete the square for the function: h=-4.9t^2+24.5t+6 Click here to see answer by richwmiller(9135)   Question 253340: i need help in this homework because i am taking geometry and i forget about algebra if u can help me please what are the steps in the solution for this given equation? 5(4+x)=32-x 20+5x=32-x 20+5x+x=32-x+x 20+6x=32+0 20+6x=32 6x=12 x=2 thanks Click here to see answer by Edwin McCravy(8909)   Question 253341: How do you complete the square for the function: y=-0.5x^2+2x+3 Click here to see answer by Greenfinch(383)   Question 253350: state all the values of k that would make the following have imaginary roots: x^2-9x+k=0 please show work Click here to see answer by palanisamy(496)   Question 253412: A sport store sells about 50 mountain bikes per month at a price of $220 each. For each $20 decrease in price, about 10 more bikes per month are sold. Write a quadratic function in standard form that models the revenue from bike sales. What price produces the maximum revenue? Click here to see answer by richwmiller(9135)   Question 253382: solve: Click here to see answer by Nikki456(9)   Question 253454: if a/b = c and x/a = c then a = (A) x+b (B) ± xb (C)±√xb D) ±√x+b e) (x+b)^2 Click here to see answer by palanisamy(496)   Question 253497: an emergency flare is fired from a vehicle.its height ,h metres,is given by h(t)= -5t^2+35t+50,where t is the time in seconds. what is the maximum height reached by the flare and how long does it take to reach the maximum height? How long does it take the flare to hit the ground? i got the height at 85m Click here to see answer by richwmiller(9135)   Question 253497: an emergency flare is fired from a vehicle.its height ,h metres,is given by h(t)= -5t^2+35t+50,where t is the time in seconds. what is the maximum height reached by the flare and how long does it take to reach the maximum height? How long does it take the flare to hit the ground? i got the height at 85m Click here to see answer by Alan3354(30993)   Question 253500: 3x-1 over x-8 subtract -4 < 0 and the sign has the line under it 3x^2=4x-11 Click here to see answer by richwmiller(9135)   Question 253500: 3x-1 over x-8 subtract -4 < 0 and the sign has the line under it 3x^2=4x-11 Click here to see answer by solver91311(16885)   Question 253501: sketch the graph of f(x)=3(x-1)(x+4), state the x-intercepts and the co-ordinates of the vertex. Click here to see answer by richwmiller(9135)   Question 253700: how to solve a quadratic equation for x=2 and x=5 Click here to see answer by richwmiller(9135)   Question 253817: express the function f(x)=4x^2-12x +5 in factored form Click here to see answer by drk(1908)   Question 253817: express the function f(x)=4x^2-12x +5 in factored form Click here to see answer by richwmiller(9135)   Question 253694: how to solve a quadratic equation for x=2 and x=5 Click here to see answer by ankor@dixie-net.com(15652)   Question 253694: how to solve a quadratic equation for x=2 and x=5 Click here to see answer by JimboP1977(308)   Question 253836: how do i use the discriminant to determine how many real number solutions the quadratic equation -4j^2+3j-28=0 has? Click here to see answer by JimboP1977(308)   Question 253942: We are studying for a test on Quadratic equations. Equation is: 2x^2+4x-6=0 Why if the Discriminant is -b (plus or minus) square root of b^2-4ac/2Xa does Algebra.com solve it as -4 (plus or minus) square root of 4^2+4x2x(-6)/2x2 What does the +or- mean? Is there a clear explanation? For instance, when does it change a numeric in the square root equation; what is the rule? Thanks, Shawn G Click here to see answer by Alan3354(30993)   Question 254002: What do I do when i get to: x= 8 +/- 6 the square root of 3 all divided by 2 the original question was Click here to see answer by drk(1908)   Question 254013: how do i get 2 decimals for the answer? Click here to see answer by jim_thompson5910(28595)   Question 254049: please help me solve this equation Click here to see answer by solver91311(16885)   Question 254065: what is the value of x using the equation Click here to see answer by richwmiller(9135)   Question 254079: 80% of what number is 252? Click here to see answer by richwmiller(9135)   Question 254212: Are the following functions linear, quadratic or neither of the two? Explain how you know. - y=3x-5 - y=(3x-2)(x+6) Click here to see answer by richwmiller(9135)   Question 254212: Are the following functions linear, quadratic or neither of the two? Explain how you know. - y=3x-5 - y=(3x-2)(x+6) Click here to see answer by Edwin McCravy(8909)   Question 254213: Explain how you know if the graph of a quadratic is wider or narrower than the standard quadratic, y=x^2. Click here to see answer by Edwin McCravy(8909)   Question 254221: A.construct a table of values for y=x^2-4x+3. use 0 B. Using your table from A, draw a table a graph of y=x^2-4x+3 in the space at the right. c. based oon your graph and table, when x^2-4x+3=0 what is x?__________________ D. what is the formula of the line of reflection?_____________ E. what are the coordinates of the turning point?_____________ please please please answer my questions. Click here to see answer by richwmiller(9135)   Question 254241: how do you find the points for y=5x squared to graph the parabola? Click here to see answer by richwmiller(9135)   Question 254244: Solve y=x^2-4 and graph If applicable I need intercepts, vertices and the solution. Thank You Click here to see answer by MRperkins(300)   Question 254215: For each of the following quadratics, A. y=-2(x+1)^2+8 B. y=x^2+6x-16 - Find the coordinates of the vertex - Direction of opening - Identify if the graph is wider or narrower than normal - Find the equation of the axis of symmetry - Find the y-intercept - Find the x-intercept - Give the domain and range for each quadratic - Draw a sketch of the quadratic. Be sure to label the vertex and axis of symmetry clearly. Use the staircase method, the x-intercepts or a point of the axis of symmetry to find the actual width of the graph. Click here to see answer by drk(1908)   Question 254208: Find the equation of a quadratic equation if the vertex is (-3, -2) and it passes through the point (-2, 0). Click here to see answer by drk(1908)   Question 254255: the area of a rectangle is 2x^2 - 11x + 15 square feet. The length of the rectangle is 2x - 5 feet. What is the width of the rectangle? Click here to see answer by drk(1908)   Question 254294: I need to solve this equation with the quadratic formula. What i got was -6 + or - Squareroot of 31 I have done this twice but i seem to get it wrong every time then i also got -12 + or - squareroot of 31 and that was wrong to please help me. Click here to see answer by Alan3354(30993)   Question 254294: I need to solve this equation with the quadratic formula. What i got was -6 + or - Squareroot of 31 I have done this twice but i seem to get it wrong every time then i also got -12 + or - squareroot of 31 and that was wrong to please help me. Click here to see answer by richwmiller(9135)   Question 254294: I need to solve this equation with the quadratic formula. What i got was -6 + or - Squareroot of 31 I have done this twice but i seem to get it wrong every time then i also got -12 + or - squareroot of 31 and that was wrong to please help me. Click here to see answer by stanbon(57347)   Question 254294: I need to solve this equation with the quadratic formula. What i got was -6 + or - Squareroot of 31 I have done this twice but i seem to get it wrong every time then i also got -12 + or - squareroot of 31 and that was wrong to please help me. Click here to see answer by JimboP1977(308)

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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