can someone please show me how to get a factor? like (Factor 9x^3 + 18x^2 – x – 2)

Question

ivettef365 · Answer

factor in parts as follows;
9x^3+18x^2  =  9x^2(x+2)
-x-2 = -(x+2)

so you have

9x^2(x+2)-(x+2)

ivettef365 · Answer

now you combine as follows:

(9x^2-1)(x+2)

ivettef365 · Answer

and you can factor more as follows:

(3x-1)(3x+1)(x+2)

anonymous · Answer

make it into 2 equations by seperating them like
(9x^3 + 18x^2) - (x - 2)
then it becomes
9x^2(x - 2)(x - 2)
so 
(x - 2)(9x^2 - 1)
does that help?

anonymous · Answer

sorry (x + 2)(9x^2 - 1)

bradely · Answer

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anonymous · Answer

how did it go from 9x^3 to 9x^2? sorry i'm a bit confuse

anonymous · Answer

because you can see that the common denominator of the equation (9x^3 + 18x^2) is 9x^2 so then it becomes 9x^2(x + 2)

anonymous · Answer

sorry that took me awhile, but Thank you! i just needed some refreshing :D thanks again!