SOLUTION: how do you do factorization by grouping for the following: 20z^2-8zx-45zx+18x^2

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Question 768437: how do you do factorization by grouping for the following:
20z^2-8zx-45zx+18x^2
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
20z^2-8zx-45zx+18x^2
:
Group them like this
(20z^2-8zx) - (45zx-18x^2)
:
Factor out common terms
4z(5z-2x) - 9x(5z-2x)
:
Factor our (5z-2x)
(5z-2x)(4z- 9x)