Question

Simplify: √45 − √²20
+ 4√ 5

Answer 1

Answer:

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Answer 2

Step-by-step explanation:

let x=√45 - √

$let \: x = \sqrt{45} - \sqrt[2]{20} + 4 \sqrt{5} \\ by \: squaring \: both \: sides \: \\ { x}^{2} = {(\sqrt {45} - \sqrt[2]{20} + 4 \sqrt{5})}^{2} \\ {x}^{2} = 45 + \sqrt{20} + 80 \\ {x}^{2} = 125 + 2 \sqrt{5} \\ answer$