Question

Simplify using suitable formula:
$(\frac{x}{5}+6)$ $(\frac{x}{5}-6)$

Answer 1

$(\frac{x}{5}+6)(\frac{x}{5}-6)$

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

$a=\frac{x}{5}$ $b=6$

$=(\frac{x}{5}{)}^2-(6{)}^2$

$=\frac{x^2}{25}-36$