Question

EXI
1. Simplify:
(1) √4-3√20 + 4√5
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Answer 1

Answer:

$= \sqrt{4 } - 3 \sqrt{4 \times 5} + 4 \sqrt{5} \\ = \sqrt{4} - 3 \sqrt{4} \times \sqrt{5} + 4 \sqrt{5} \\= - 2\sqrt{4} \times 5\sqrt{5} \\ = - 10 \sqrt{20}$

may be it will help you

don't know it is right or wrong but just tried my best to solve it