SOLUTION: We are having trouble factoring on this problem: 12y^2-24y-72 We took out the 12 and got 12(y^2-2y-6) We can't think of any factors of -6 that would give a -2. Is there a solut

Question 134968: We are having trouble factoring on this problem:
12y^2-24y-72
We took out the 12 and got 12(y^2-2y-6) We can't think of any factors of -6 that would give a -2. Is there a solution, or do you think it was typed incorrectly on the worksheet? Thank you!
PS. This didn't come from a textbook, but from a teacher-created worksheet.
Found 2 solutions by vleith, stanbon:
Answer by vleith(2983) (Show Source): You can put this solution on YOUR website!
Use the quadratic formula.

a =1, b = -2, c =-6

Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
We are having trouble factoring on this problem:
12y^2-24y-72
= 12(y^2-2y-6)
Factoring y^2-2y-6 with the quadratic formula:
y = [2 +- sqrt(4 -4*1*-6)]/2
y = [2 +- sqrt(28)]/2
y = [1 +- sqrt7]
Factors are 12, (y-(1+sqrt7)), (y-(1-sqrt(7))
===========================
Cheers,
Stan H.
RELATED QUESTIONS
Confused about this one. I got to the part where it's in a quadratic equation and I can... (answered by Alan3354)
We are finding the vertex, focus or directive. Then finding an equation and graphing.... (answered by scott8148)
Hi, My Son as these two equations that we can not get the right answers needed. Both... (answered by solver91311)
We are stumped Problem, solve equation: 18y^2+24y+18=0 we tried this... (answered by jim_thompson5910)
I am having trouble figuring out how to use the identity property of 1 (how it works) on... (answered by rapaljer)
Hello! I am having trouble with my algebra homework. On one of the equasions we need to... (answered by stanbon)
This problem isn't in the book (4y+2)(1/6)y Well I know you have to multiply 1/6 by 6... (answered by rchill)
i am having trouble understanding these types of questions..can you help? length of... (answered by stanbon)
We have had extreme trouble with this one. There are four of us and each of us comes up... (answered by stanbon)