Questions on Algebra: Quadratic Equation answered by real tutors!

Tutors Answer Your Questions about Quadratic Equations (FREE)

Question 286800: Solve using quadratic formula: r(r-10)=-29
I am also having problems with 3y^2-14y-24=0
If you can help with both, I would highly appreciate it. If you can only do one, please help me work out the first one. Thank You!
Click here to see answer by nyc_function(2733)

Question 286767: If x^2 + y^2 = 40 and xy = 12, then x + y =
A. 7. B. 8. C. 7 or −7. D. 8 or −8. E. None of these.
Click here to see answer by checkley77(12569)

Question 287033: what is v squared over 25 minus 1 equals 11
Click here to see answer by richwmiller(9135)

Question 287033: what is v squared over 25 minus 1 equals 11
Click here to see answer by brucewill(101)

Question 287134: If a rock is dropped off of a bridge that is 30 feet above a river, how long will it take to hit the water?
Click here to see answer by nyc_function(2733)

Question 287219: can you tell me which one of this two =to 0 and can you give me the whole work out how the answer came up to (4x+1) or 2x-7) thank you ,give me all of the work that came up with thwanswer so that I can understand how the answer got there so I know what i'm doing wrong. thank you
Click here to see answer by richwmiller(9135)

Question 287217: How many different real solutions does the following equation have?
x^3 - 3x^2 + 7x - 5 = 0
A. 0 B. 1 C. 2 D. 3 E. 4
Click here to see answer by richwmiller(9135)

Question 287323: 1. One leg of a right triangle is 2 feet longer than the other leg. The hypotenuse is 10 feet long. Find the length of the legs of the triangle?
2. One leg of the right triangle is 5 units. The hypotenuse is one unit longer than the other leg. What is the length of the hypotenuse and the other leg?
Click here to see answer by josmiceli(9679)

Question 287399: My problem is:Identify the completing the squares, the vertex, the y-intercept and the axis of symmetry.
1. y=x^2+6x-11
2. y=3x^2-x+4
3. y=2x^2+7x-3
4. y=2x^2-8x-12
I need step by step answers
my email address is gdkpw@hotmail.com
Thank you
Click here to see answer by josmiceli(9679)

Question 287525: solving for zeros the equation is. y=x^(4)-13x^(2)+36
Click here to see answer by stanbon(57347)

Question 287661: Solve by using the quadratic formula: x2 + 7x = -3.
Click here to see answer by texttutoring(324)

Question 287759: find the quadratic function that indicate vertex (5,12) and passes through points (7,15)?
Click here to see answer by josmiceli(9679)

Question 287759: find the quadratic function that indicate vertex (5,12) and passes through points (7,15)?
Click here to see answer by richwmiller(9135)

Question 287935: factor:
2x^2+32x+126
Click here to see answer by Grinnell(63)

Question 287955: I need your help on Solving Quadratic Equations by Graphing. I get the graphing part but it is just the equation y^2-4y+1.
I do know how to get the vertex and then I get blank after the I get vertex.
Click here to see answer by Alan3354(30993)

Question 287993: WHAT IS A LINEAR TERM ?

Click here to see answer by richwmiller(9135)

Question 287990: describe the sequance of trnsformation from f(x)=x^2 to g. Then sketch the graph of g. verify with a graphing ulitity.
g(x)=(x+4)2
Click here to see answer by stanbon(57347)

Question 287907: f(x)=-2x^2+2x+6
1.) What is the x-coordinate of the vertex?
2.) What is the y-coordinate of the vertx?
3.) The equation of the line of symmetry is x=______
4.) The maximum/minimum of f(x) is ________
5.) The value f(1/2)=13/2 is minimum or maximum?
Click here to see answer by jsmallt9(3296)

Question 288088: I need help with a few problems. Could you walk me through step by step on how to do them?
1) 5x^2 -72=0
Sorry to bother you with this but i really need help.
Thank you,
Jed LaCoste
Click here to see answer by richwmiller(9135)

Question 288177: how do i solve 3x^2-5x-7=0?
Click here to see answer by richwmiller(9135)

Question 288134: Please help with this question if possible

Solve x^2 - 7x - 3 = 0 for x using any method you prefer
john
Click here to see answer by richwmiller(9135)

Question 288223: i am doing my math homework right now and i keep trying to solve a word problem that has to do with geometry and and quadratics...the word problem says The legs of an isosceles triangle measure two x to the fourth power plus 2x minus one units. The perimeter of the triangle is 5x to the fourth power minus 2x to the third power plus x minus three units write a polynomial that represents the measure of the base of the triangle
Click here to see answer by ankor@dixie-net.com(15652)

Question 288244: how can i facto the following equation using the zero product property?
10^2-25x+10^2=0
Click here to see answer by Alan3354(30993)

Question 288215: The amount of background noise is important to television news reporters. One station developed the formula n= -t^2 + 12t +54 showing the noise level in decibels (N) as it relates to the time after the speaker stops talking in seconds (t). How many seconds after the speaker stops will the noise level
be the greatest? Write and tell how you decided.
Click here to see answer by amnd(23)

Question 288289: I need to complete the square:
I've been using to figure out the formula since I know the answer to this second one.
I used the Complete the Square Solver on here, but it comes up with a different answer than the book.
The formula I'm using is: x=-4 +or- square root of (4)^2-4(2)(-1) over 2(2)
so, -4+or- square root of 16 + 8 over 4
then -4+or- square root of 24 over 4
then -4+or- 2 times square root of 6 over 4
after simplifying, i get -1+or- square root of 6 over 2.
My book says the answer is -2+or- square root of 6 over 2.
Where did I go wrong?? If I can't solve THIS one, then I know I can't solve the others.
Could somebody please explain where I messed up? I'm assuming I should have multiplied something by 2 somewhere along the way to come up with the book answer, but I can't figure out where or more importantly, WHY.
Thanks for any help given, I appreciate it!
Click here to see answer by stanbon(57347)

Question 288296: I asked this problem earlier, but have learned how to type it so that it is easier for you to read and understand. I need to square this problem.
Problem: 2x^2+4x-1=0
Formula I used was:
I got:

then
then
then (this is supposed to read "+ or - 2" not -2)
then (this is supposed to read "+ or - 2", not -2)
then after simplifying, I get

My book says the answer is:
I can't figure out where I went wrong, so I can't answer my real question of 2x^2+10x-3=0.
Any help is appreciated!! Thank you!
Click here to see answer by stanbon(57347)

Question 288295: I asked this problem earlier, but have learned how to type it so that it is easier for you to read and understand. I need to square this problem.
Problem: 2x^2+4x-1=0
Formula I used was:
I got:

then
then
then (this is supposed to read "+ or - 2" not -2)
then (this is supposed to read "+ or - 2", not -2)
then after simplifying, I get

My book says the answer is:
I can't figure out where I went wrong, so I can't answer my real question of 2x^2+10x-3=0.
Any help is appreciated!! Thank you!
Click here to see answer by Alan3354(30993)

Question 288313: This word problem pertains to "REVENUE".
The demand for a certain product is given by p=26-.01x, where x is the number of units sold per month and p is the price, in dollars, at which each item is sold. The monthly revenue is given by R=xp. What number of items sold produces a monthly revenue of $16,500.
I was on a roll for a while, but now I'm stuck again. I missed class last week (job sent me out of country) and I seriously don't even know where to begin with this. The book doesn't clearly state what I should do with this problem (like if I should use the quadratic formula or something along those lines) and I can't find any examples similar to it to try and work with.
I was thinking something like:
$16,500=x(26-.01x)
so, $16,500=26x-2.86x^2
then, divide the left side by 2?
so, $16,500=13x-1.43x
then, $16,500=11.57x
Okay, so then it would be $1,426.10=x?
This doesn't seem right.
Could somebody please explain how I am supposed to find the solution for this type of problem?
Thanks! Any help is appreciated!
Click here to see answer by jaydducote(11)

Question 288323: Edward left his estate of $210,000 to his two children and his favorite charity. Each child received 3 times the amount left to his favorite charity. How much did each child and the charity receive?
Click here to see answer by checkley77(12569)

Question 288392: Question regarding about Quadratic Function.
This is the problem:
A quadratic function is given below:
f(x)=3x^2-x+6
What is f(2)?
A. 40
B. 28
C. 16
D. 4
If you may explain how to solve this I would really appreciate the help. I don`t know any strategies that can help me solve this problem aside from having a calculator.
Thank you SO much for the time and effort.
Regards,
Alex H.
Click here to see answer by nerdybill(6959)

Question 288466: Consider the quadratic equation,
Which of the following statements is true?
A y is a function of x but x is not a function of y
B y is a function of x and x is a function of y
C y is not a function of x and x is not a function of y
D y is not a function of x but x is a function of y
I pretty much crossed out c and d because I'm pretty sure y IS a function of x... but I'm not sure if x is a function of y.
Thankyou! (:
Click here to see answer by richwmiller(9135)

Question 288494: Joe has made a quilt that is 4 feet by 5 feet. He wants to use the remaining 10 square feet as a decorative border of uniform width. What should the width of the border be?
Click here to see answer by stanbon(57347)

Question 288557: Compute the discriminate. Then determine the number and type of solutions for the given equation
9 x² -7x+5 =0

Click here to see answer by ankor@dixie-net.com(15652)

Question 288680: What is the only solution for x in the equation
x² -16x + 64 = 0?
Click here to see answer by jim_thompson5910(28595)

Question 288697: please help me with this problem
which quadratic has roots 3 + i and 3 i?
1. x2 6x + 10 = 0
2. x2 + 6x 10 = 0
3. x2 6x + 8 = 0
4. x2 + 6x 8 = 0

Click here to see answer by jim_thompson5910(28595)

Question 288725: How many ways can a line intersect a parabola? Explain with examples
Click here to see answer by Fombitz(13828)

Question 288724: A picture that measures 10cm by 8cm is to be surrounded by a mat before framing. The width of the mat is to be the same on all sides of the picture. The area of the mat is equal to the area of the picture. What is the width of the mat, to the nearest tenth of a centimetre?
Click here to see answer by checkley77(12569)

Question 288753: A total of 1135 people attended a concert. Floor tickets cost $40 each, while balcony tickets cost $28 each. If a total of $40,480 was collected, how many of each type of ticket were sold?
Click here to see answer by checkley77(12569)

Question 288751: A jacket was marked down in price by 15%, and then later was marked down by an additional $35. Its sale price was $173.25. What was its original price?
Click here to see answer by checkley77(12569)

Question 288755: The time, t, it takes for an ice cube to melt is inversely proportional to the temperature of the water it is in. If it takes an ice cube 2.5 minutes to melt in 70 degree F water, how long will it take an ice cube of the same size to melt in 50 degree water?
Click here to see answer by richwmiller(9135)

Question 288760: Mary left her estate worth $132,000 to three relatives. Her brother received 3 times as much as the cousin, and her daughter received 7 times as much as the cousin. How much did each relative receive?
Click here to see answer by Deina(147)

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