Question

Factor Completely: x2 - 81

A.(x-9)(x+9)
B.(x+9)(x+9)
C.(x-9)(x-9)
D.(9-x)(9+x)

Answer 1

the answer is A

Explanation:

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Answer 2

Answer is A

The binomial can be factored using the difference of squares formula a2-b2 = (a+b) (a-b) where a=x and b=9

(X+9) x(x-9)