Questions on Algebra: Quadratic Equation answered by real tutors!

Tutors Answer Your Questions about Quadratic Equations (FREE)

Question 327150: Please help me solve this equation: 3x^2-1=6x
Click here to see answer by solver91311(24713)

Question 327120: The percentage of the U.S. population that is foreign born are listed in the table
year / Percent
_______________
1950 / 6.9
1960 / 5.4
1970 / 4.8
1980 / 6.2
1990 / 7.9
2000 / 10.4
Let f(t) represent the percentage of the U.S. population that is foreign born t years since 1950. Find a reasonable quadratic model for f(t).

Click here to see answer by Fombitz(32388)

Question 327152: Please help me solve the equation: A=1/2h(b+c)f or h
Click here to see answer by Fombitz(32388)

Question 327251: solve x^2+5x-7 to give the exact solutions and then give approximate solutions to three decimal places. I can not figure it out Would you please help.
Click here to see answer by solver91311(24713)

Question 327254: y^2-16y+64=1 solve for exact solutions
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Question 327255: solve for r r^2+3r=3
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Question 327261: The weight that a horizontal beam can support varies inversely as the length of the beam. Suppose that a 10-m beam can support 740 kg. How many kilograms
can 2-m beam support?
Thanks in advance to anyone that can help me out.
I must show the 5-6 step solving procces. Thanks!
Click here to see answer by solver91311(24713)

Question 327253: (x-8)=25 solve for exact solutions
Click here to see answer by rfer(16322)

Question 327281: Could you please help me solve this equation: S= -16t^2 + v*t + k
Using the height of 313,2 meters from the eiffel tower if a child was throwing a ball off of the eiffel tower.
When a ball is thrown up into the air, it makes the shape of a parabola. The equation S= -16t^2 + v*t + k gives the height of the ball at any time, t in seconds, where �v� is the initial velocity (speed) in ft/sec and �k� is the initial height in feet (as if you were on top of a tower or building).
Make up a scenario where a ball is thrown, shot, etc. into the air. You can choose any initial velocity (in feet/sec) and any initial height (in feet) of the ball, but include them in your written scenario. The ball can leave your hand, the top of a building, etc. so you can use many different values for the initial height.
Click here to see answer by solver91311(24713)

Question 327308:
Could I please have some help with this problem. I am really back at this when it comes to square roots. Thank you
(3- 2square root7)(3+ 2square root 7)
Click here to see answer by Alan3354(69443)

Question 327267: The enttrance to a tent is the shape of an equilateral triangle. If the base of the tent is 10 feet wide, how tall is the tent?
I must show the 5-6 steps of problem solving.
Thank you to anyone that can help me out.
Click here to see answer by jvan(28)

Question 327379: I saw this problem in my textbook:
A rectangle has a perimeter of 42 miles and an area of 104 square miles. Find the dimensions of the rectangle.
My question is... how do you get the answer? I've tried making two equations and solving for one variable, but it didn't work.
Click here to see answer by Fombitz(32388)

Question 327388: Please help solve the following equation using Quadratic Form (NOT formula):

Click here to see answer by stanbon(75887)

Question 327388: Please help solve the following equation using Quadratic Form (NOT formula):

Click here to see answer by Earlsdon(6294)

Question 327415: "A projectile is thrown upward so that its distance, in feet, above the ground after t seconds is h(t)= -14t^2 + 336t. What is its maximum height?"
Click here to see answer by Alan3354(69443)

Question 327477: In the equation -0.2x^2+12x+11, would the graph open up or down? What would happen to sales as time goes by? Last day of sales? Will tickets peak, highs,lows etc. How many will be sold? What is the point of the vertex? I know I should use the quadratic equation but am at a loss of where to go next.
Click here to see answer by checkley77(12844)

Question 327504: This problem was under the section Quadratic equations and problem solving... in my book. The problem is:
The sum of the squares of two consecutive negative integers is 221. Find the integers. I worked out the problem to make it a quadratic. My question is: How does the book get the answer of -10 and -11? I don't understand when... subsituting the numbers into the first sentence gets the right answer.
Click here to see answer by Fombitz(32388)

Question 327534: I saw this problem in my textbook:
A rectangular pool is surrounded by a walk 4 meters wide. The pool is 6 meters longer than its width. If the total area is 576 square meters more than the area of the pool, find the dimensions of the pool.
How do they get the answer? I've tried by making Total Area = x^2+6x+576, but have been unable to obtain the answer.

Click here to see answer by scott8148(6628)

Question 327454: I saw this problem in my textbook:
A rectangular pool is surrounded by a walk 4 meters wide. The pool is 6 meters longer than its width. If the total area is 576 square meters more than the area of the pool, find the dimensions of the pool.
How do they get the answer? I've tried by making Total Area = x^2+6x+576, but have been unable to obtain the answer.
Click here to see answer by ankor@dixie-net.com(22740)

Question 327860: Hello. Could you please help me?
I have to factor these completely, and if prime, say so.
Can you please show me how? Thank you so much.
e. 125r^3 - 8s^3
f. 5c^2 + 2c - 3
g. 16u^4 - v^4
thank you.

Click here to see answer by romerr1(7)

Question 327900: i am doing completing the square and i want to make sure i have it right
solve: x squared + 2x = 8 by completing the square
Click here to see answer by stanbon(75887)

Question 327900: i am doing completing the square and i want to make sure i have it right
solve: x squared + 2x = 8 by completing the square
Click here to see answer by Earlsdon(6294)

Question 327900: i am doing completing the square and i want to make sure i have it right
solve: x squared + 2x = 8 by completing the square
Click here to see answer by meay7c(10)

Question 327905: x^2+.59x-53.86=0
Click here to see answer by Edwin McCravy(20054)

Question 327916: If you are looking at a graph of a quadratic equation, how do you determine where the solutions are?
Click here to see answer by Fombitz(32388)

Question 327983: What is the sum of the 2 real solutions to the equation x = 6 � x^2 ?

Click here to see answer by galactus(183)

Question 327999: y^2=4/5y+4/7= 2 real solutions, one real or two non-real. I say one real because the fractions are opposites of each other? Right? x^2+6x+9=25 solve for x In this equation it asks for an exact amount.Couldn't I factor this one out to find the value? 9x^2+12x+4 find x and y intercepts At total loss on this one.
Click here to see answer by Fombitz(32388)

Question 328056: Hello. I was hoping you could please help me with this problem.
I have to factor completely, and if prime, say so.
a. 40x^3 - 64x^2y
b. 13-14y + y^2
c. 9x^2- 30 + 25
I was hoping you could please show me how to factor these, because I don't know how to. Thank you so much.

Click here to see answer by ankor@dixie-net.com(22740)

Question 328148: How would I graph the following quadratic function and label the vertex.
f(x) = 2x^2-12x+10
Click here to see answer by nyc_function(2741)

Question 328177: The length of a rectangle is twice the width. The area is 512 yd^2. Find the length and the width. The length is how many yards? The width is how many yards?
Click here to see answer by nyc_function(2741)

Question 328175: #1. A student opens a mathmatics book on two facing pages. The product of the page number is 272. Find the page numbers. The first page number is ? The second page number is ?
2.The number of tickets sold each day for an upcoming performance of Handel's Messiah is given by N(x)= -0.3x^2+6.6x+15, where x is the number of days since the concert was first announced. When will daily ticket sales peak and how many tickets will be sold that day? Ticket sales will peak how many days after the concert was first announced? The number of tickets sold on that day will be how many? Round to the nearest integer.
Click here to see answer by Alan3354(69443)

Question 328150: How would I determine whether the functionc have a minimum or maximum value and then find the value?
g(x)=-4x^2+8x+3
Click here to see answer by nyc_function(2741)

Question 328203: how do I evaluate 2sqrtx=x-8 into the ax^2+bx+c=0 form of the quadratic equation?
Click here to see answer by Alan3354(69443)

Question 328217: How do I factor 3y^2+2y-8??
Thank you!
Click here to see answer by user_dude2008(1862)

Question 328143: Aki's Bicycle Designs has determined that when x hundred bicycles are built, the average cost per bicycle is given by C(x)=0.2x^2-1.9x+10.614, where C(x) is in hundreds of dollars. How many bicycles should the shop build to minimize the average cost per bicycle? The shop would build how many bicycles?
Click here to see answer by edjones(8007)

Question 328155: How would I find the vertical and horizontal asymtotes of the following function?
g(x)=5x-2/4x^2-4x-3
Click here to see answer by edjones(8007)

Question 328376: find and label the vertex and the line of symmentry. Graph the function f(x)=-1/3 x^2
Click here to see answer by Fombitz(32388)

Question 328378: A.) solve 5x^2=15 what are the solutions?
B.) find the x-intercepts of f(x)=5x^2-15?
Click here to see answer by Fombitz(32388)

Question 328378: A.) solve 5x^2=15 what are the solutions?
B.) find the x-intercepts of f(x)=5x^2-15?
Click here to see answer by Alan3354(69443)

Question 328383: solve the formula for the given letter. Assume all variables represent non-negative numbers. E=mc^2, for c.
Click here to see answer by Fombitz(32388)

Question 328390: Determine the nature of the solutions of the equation. y^2=2/3 y+4/3
Click here to see answer by Fombitz(32388)

Question 328267: 100x^2-60x+9=0
Click here to see answer by Fombitz(32388)

Question 328379: Solve for x. 4x^2=-13x-10
Click here to see answer by Alan3354(69443)

Question 328455: Create a quadratic equation using 2,5
Click here to see answer by solver91311(24713)

Question 328470: Find the quadratic in standard form that goes through (-4,27), (1,2) (3,34)

Click here to see answer by solver91311(24713)

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, 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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, 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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, 25741..25785, 25786..25830, 25831..25875, 25876..25920, 25921..25965, 25966..26010, 26011..26055, 26056..26100, 26101..26145, 26146..26190, 26191..26235, 26236..26280, 26281..26325, 26326..26370, 26371..26415, 26416..26460, 26461..26505, 26506..26550, 26551..26595, 26596..26640, 26641..26685, 26686..26730, 26731..26775, 26776..26820, 26821..26865, 26866..26910, 26911..26955, 26956..27000, 27001..27045, 27046..27090, 27091..27135, 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