SOLUTION: factor by grouping 20x^3-28x^2+45x-63= I am so lost. please help

Question 385252: factor by grouping
20x^3-28x^2+45x-63=
I am so lost. please help
Answer by scott8148(6628) (Show Source): You can put this solution on YOUR website!
group together the terms with common factors so that the factoring results in similar coefficients

20 and 45 are divisible by 5 , 28 and 63 are divisible by 7 ___ the resulting coefficients match

grouping ___ (20x^3 + 45x) - (28x^2 + 63)

factoring ___ 5x(4x^2 + 9) - 7(4x^2 + 9)

consolidating ___ (5x - 7)(4x^2 + 9)
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