1.

(x2_6xy + 9y2)-25

Answer»

(x^2 - 6xy + 9y^2) - 25= (x - 3y)^2 - (5)^2

We know (a^2 - b^2) = (a +b)(a-b)

= (x - 3y + 5)(x - 3y - 5) ans

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