Y=?
2006-06-17 11:42:26 · 10 answers · asked by am 1 in Science & Mathematics ➔ Mathematics
y = 3x^2 + 12x - 7
What do the directions say?
2006-06-17 12:49:30 · answer #1 · answered by MsMath 7 · 2⤊ 0⤋
lets see im reading the question as...y=3xpower if 2+12x-7= whatever right...the answer to y is to first solve x in the second equasion....which turns out to be 5/2 but when i plug that in to the first equasion i get the same answer 5/2 so yeah i might be totally worng since im really tired and absolutely no one else posted anything close to my answer but atleast i tried right...
2006-06-17 12:19:32 · answer #2 · answered by chris.baily 1 · 0⤊ 0⤋
3x^2 + 12x - 7 = 0
x = (-b ± sqrt(b^2 - 4ac))/2a
x = (-12 ± sqrt(144 - 4(3)(-7)))/(2(3))
x = (-12 ± sqrt(144 + 84))/6
x = (-12 ± sqrt(228))/6
x = (-12 ± sqrt(4 * 57))/6
x = (-12 ± 2sqrt(57))
x = -2 ± (1/3)sqrt(57)
The x-intercepts are -2 - (1/3)sqrt(57) and -2 + (1/3)sqrt(57) for a graph, go to www.calculator.com/calcs/GCalc.html and type in 3x^2 + 12x - 7
2006-06-17 13:10:27 · answer #3 · answered by Sherman81 6 · 0⤊ 0⤋
294
2006-06-17 11:57:29 · answer #4 · answered by Viking 1 · 0⤊ 0⤋
Not really much but I have,
6x^2 + 26x^3 - 7 = Y
2006-06-17 12:59:52 · answer #5 · answered by thedude2005 3 · 0⤊ 0⤋
It's hard to understand your question but I think you need to use the quadratic equation to solve for x. Use the example on the site below.
2006-06-17 13:00:35 · answer #6 · answered by b 3 · 0⤊ 0⤋
Use this page:
http://www.ifigure.com/math/basic/basic.htm
2006-06-17 12:20:30 · answer #7 · answered by Ange 2 · 0⤊ 0⤋
42 ... it is the answer to life, the universe, and everything
2006-06-17 12:01:15 · answer #8 · answered by icehoundxx 6 · 0⤊ 0⤋
i think it's 90 i am not sure about that.
2006-06-17 11:46:18 · answer #9 · answered by Rabi 3 · 0⤊ 0⤋
im not sure im only in prealgebra.......sorry for waisting you time.
2006-06-17 11:46:25 · answer #10 · answered by Metalhead4Ever 2 · 0⤊ 0⤋