SOLUTION: -36a^2 b+21ab^2-3b^3 I need to know how to factor this out thank you

Algebra ->  Polynomials-and-rational-expressions -> SOLUTION: -36a^2 b+21ab^2-3b^3 I need to know how to factor this out thank you       Log On


   

Question 160963: -36a^2 b+21ab^2-3b^3
I need to know how to factor this out thank you
Answer by scott8148(6628) About Me  (Show Source):
You can put this solution on YOUR website!
common factors first __ -3b(12a^2-7ab+b^2)

now, factors of 12 that sum to -7 __ -3b(-4a+b)(-3a+b)