Question

(x+3y) (x-3y)
answer this​

Answer 1

Answer:

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Step-by-step explanation:

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Answer 2

$\sf{\left(x+3y\right)\left(x-3y\right)}$

$\tt{\tt{Apply\:Difference\:of\:Two\:Squares\:Formula:\:}\left(a+b\right)\left(a-b\right)=a^2-b^2}$

$\sf{=x^2-\left(3y\right)^2}$

$\sf{=x^2-3^2y^2}$

$\boxed{\sf{=x^2-9y^2}}$