Question

Factorise 81x^2-225y^2

Answer 1

$81 {x}^{2} - 225 {y}^{2} \\ (9x) {}^{2} - (15) {}^{2} \\ (9x + 15y)(9x - 15y)$

Answer 2

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(9x)² -(15y)² = 0

(9x-15y)(9x+15y) = 0

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