Question

factorise 121y^2-144z^2​

Answer 1

Question :-

Factorise

$121y {}^{2} - 144z {}^{2}$

Solution :-

We know that

$(a {}^{2} - b {}^{2} ) = (a + b)(a - b)$

Hence,

$\: \: \: \: \: 121y {}^{2} - 144z {}^{2} \\ \\ = (11y) {}^{2} - (12z) {}^{2} \\ \\ = (11y + 12z)(11y - 12z) \: \: \: \: \: \: ans$