factorize x^2-y^2/9
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x^2 - y^2/9
= (9x^2 - y^2)/9
= ( (3x)^2 - (y)^2 ) / 9
Using identify a^2 - b^2 = (a+b)(a-b)
= (3x + y)(3x - y) / 9
= (9x^2 - y^2)/9
= ( (3x)^2 - (y)^2 ) / 9
Using identify a^2 - b^2 = (a+b)(a-b)
= (3x + y)(3x - y) / 9
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