Asked by Mike
find the following product:(x-3)(x+3)
Answers
Answered by
Damon
you could use FOIL or the distributive property but I see instantly that this is the factors of the difference of two squares:
a^2-b^2 = (a-b)(a+b)
so the answer by inspection is:
x^2-9
a^2-b^2 = (a-b)(a+b)
so the answer by inspection is:
x^2-9
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