Question

Solve :
$x^2-36$=0

Answer 1

$x^2-36=0$

$\Rightarrow x^2-6^2=0$

$\Rightarrow (x+6)(x-6)=0$ $(a^2-b^2=(a+b\left)\right(a-b\left)\right)$

$\Rightarrow x-6=0,x+6=0$

$\Rightarrow x=6orx=-6$