(13+x)(13-x) how to do expansion of it
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it is
a^2 -b^2 = (a+b)(a-b)
13^2-x^2=(13+x)(13-x)
169-x^2.
a^2 -b^2 = (a+b)(a-b)
13^2-x^2=(13+x)(13-x)
169-x^2.
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