Question

Simplify Each Radical Expression. Leave in radical form. (Do not use decimals.)

2[√(5)] + 3[√(20)]

Answer 1

$2\sqrt 5 + 3 \sqrt{20}\\\\\\=2\sqrt 5 + 3 \sqrt{4 \times 5}\\\\\\=2\sqrt 5+ 3\cdot 2 \sqrt 5\\\\\\=2\sqrt 5 + 6 \sqrt 5\\\\\\=8\sqrt 5$