Factor completely 49x^2 - 81 (7x+9)^2 (7x-9)^2 (7x+9)(7x-9) 7x-9

asked Feb 11, 2020 150k views

4 votes

Factor completely 49x^2 - 81
(7x+9)^2
(7x-9)^2
(7x+9)(7x-9)
7x-9

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4 votes

Answer:

Explanation:

$x^(2) -y^(2) =(x+y)(x-y)\\49x^(2)-81=(7{x})^2-{9}^2=(7x+9)(7x-9)$

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