Question

Simplify fully (− 8+ √ 5) (2 − √ 5)

Answer 1

Answer:

-21+10√5

Step-by-step explanation:

$( - 8 + \sqrt{5} ) (2 - \sqrt{5}) \\ = - 16 + 8 \sqrt{5} + 2 \sqrt{5} - 5 \\ = - 21 + 10 \sqrt{5}$

Answer 2

Answer:

$= 8 \sqrt{5 } + \sqrt{20} - \sqrt{125} \\ = 8 \sqrt{5} + 2 \sqrt{5} - 5 \sqrt{5 } \\ = 10 \sqrt{5} - 5 \sqrt{5} \\ = \sqrt{5} (10 - 5) \\ = 5 \sqrt{5} a \\ \: \: answer$

This is the answer.