Factor this expression completely 9x^2- y^2

(3x - y)(3x + y)

Step-by-step explanation:

Both 9x^2 and y^2 are perfects squares.

The rule for factoring perfect squares is a^2 - b^2 = (a - b)(a + b).

Here, factoring (3x)^2 - y^2 results in (3x - y)(3x + y).

answer: c

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but i think the formula is f(x)=6x

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step-by-step explanation:

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