Question

Estimate:
√5 + √15

8

4

6

Answer 1

$x= \sqrt{5} + \sqrt{15}$
$x^{2} =( \sqrt{5} + \sqrt15} )^2$
= 5 + 15 + 2 √5√5√3
=20 + 10√3
≈20+16
≈36

x≈6