Question

factorise 81y^2- 144x^2

Answer 1

ok so easy

(9y)^2-(12x)^2

(9y-12x)(9y+12x)

Answer 2

hello mate!.....


$given..... \\ \\ 81y {}^{2} - 144x {}^{2} \\ \\ 9 {}^{2} y {}^{2} - 12 {}^{2} x {}^{2} \\ \\ we \: know......(x + y)(x - y) = x {}^{2} - y {}^{2} \\ \\ (9y) {}^{2} - (12x) {}^{2} \\ \\ (9y + 12x)(9y - 12x) \\ \\ hope \: it \: helps \: u \: dear...$