SOLUTION: How do I multiply this? (x^2+7x)(x^2-7x)

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Question 464758: How do I multiply this?
(x^2+7x)(x^2-7x)
Answer by robertb(5830) About Me  (Show Source):
You can put this solution on YOUR website!
It becomes a difference of two squares: %28x%5E2%29%5E2+-+%287x%29%5E2+=+x%5E4+-+49x%5E2