SOLUTION: How would I multiply (5z-9)(5z+9)? This is what I have 25z-81.

SOLUTION: How would I multiply (5z-9)(5z+9)? This is what I have 25z-81.

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Question 942571: How would I multiply (5z-9)(5z+9)? This is what I have 25z-81.
Answer by rfer(16322) (Show Source): You can put this solution on YOUR website!
25z^2+45z-45z-81
25z^2-81
You almost got, but 5z*5z=25z^2
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