Question

Calculați:
$\sqrt{4 - \sqrt{7} } \times \sqrt{4 \times + \sqrt{7} }$

Answer 1

$\sqrt{ 4^{2}- V7^{2} }= \sqrt{16-7}= \sqrt{9}=3$

Answer 2

√a*√b=√(ab)
si
(a-b) (a+b) =a²-b²
atunci
√(16-7)=√9=3
as simple as that!!