Question

(5 + root 5) (5 - root 5)​

Answer 1

Answer:

(a+b)²=a²+b²+2ab

solve it by this equation

Answer 2

Answer:

$\sf \longrightarrow \Big(5+\sqrt{5}\Big)\Big(5-\sqrt{5}\Big)$

$\sf \longrightarrow{\color{red} {Using :-(a+b) (a-b) ={a}^{2}-{b}^{2}}}$

$\sf \longrightarrow {\big(5\big)}^{2}-{\big(\sqrt{5}\big)}^{2}$

$\sf \longrightarrow 5-\sqrt{25}$

$\sf \longrightarrow 5-5$

$\longrightarrow {\boxed {\bf 0}}$