Question

Can someone explain to me how to do this question? It needs to be simplified and no decimals or fractions.

Answer 1

$\sqrt{180} - \sqrt{45 } \\ = \sqrt{2 \times 2 \times 3 \times 3 \times 5} - \sqrt{3 \times 3 \times 5 }$

Taking common

$\sqrt{3 \times 3 \times 5} ( \sqrt{4} - 1) \\ = 3 \sqrt{5} (2 - 1) \\ = 3 \sqrt{5}$

Hope it helps mate

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