Answers

2015-06-30T17:34:17+08:00
64-9x^2 if the special product is the sum and difference of two same terms
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2015-06-30T17:35:55+08:00
= −9+ 64

Note:
I suggest that you should use the FOIL method (First, Outer, Inner, Last)
This question is a type of special products, the difference of the squares of the terms.
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