Question

simplify
√45 − 3√20 + 3√5​

Answer 1

Answer:

√45 − 3√20 + 3√5

$\to \sqrt{5 \times 9} - 3 \sqrt{5 \times 4} + 3 \sqrt{5} \\ \\ \to \: 3\sqrt{5} - 12 \sqrt{5} + 3 \sqrt{5} \\ \\ \to 6\sqrt{5} - 12\sqrt{5} \\ \\ \to - 6\sqrt{5}$