Question

The value of is
$( \sqrt{5} - 2)( \sqrt{5} + 2)$

​

Answer 1

Step-by-step explanation:

( a + b)²= a²+2ab + b²

(√5+√2)²=(√5)²+2×√5×√2+(√2)²

=5+2√10+2

= 7+2√10