Question

Evaluate: : 4√20 + 1 2 √245 - √405

Answer 1

4√20 + 1 2 √245 - √405

$4 \sqrt{2 \times 2 \times 5} + 12 \sqrt{7 \times 7 \times 5} - \sqrt{9 \times 9 \times 5}$

$4 \times 2 \sqrt{ 5} + 12 \times 7 \sqrt{5} - 9\sqrt{5}$

$8\sqrt{ 5} + 84 \sqrt{5} - 9\sqrt{5}$

$83 \sqrt{5}$

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