Question

Factorize:

$36a^2-84ab+49b^2$

Answer 1

$36a^2-84ab+49b^2$

$=(6a{)}^2-84ab+(7b{)}^2$

$=(6a{)}^2-2.6a.7b+(7b{)}^2$

$=(6a-7b{)}^2$

$=(6a-7b)(6a-7b)$