SOLUTION: factor by grouping 4z^2+8z-az-2a factor the trinomial 2s^2-9s+9 factor r^2-64

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Question 604838: factor by grouping
4z^2+8z-az-2a
factor the trinomial
2s^2-9s+9
factor
r^2-64

Answer by alicealc(281) About Me  (Show Source):
You can put this solution on YOUR website!
4z%5E2%2B8z-az-2a
=4z%28z%2B2%29-a%28z%2B2%29
=%28z%2B2%29%284z+-+a%29

2s%5E2-9s%2B9
=(2s - 3)(s - 3)

r%5E2-64
=(r - 8)(r + 8)