Question

Factorise the following:
$a^2+8a+16$

Answer 1

We will use the identity ${\left(a+b\right)}^2=a^2+2ab+b^2$ to factorize the given expression.

$a^2+8a+16=a^2+2\times a\times 4+4^2$

$=(a+4{)}^2$