Simplify the expression: 20 square + 2 square root of 5 - 3 square root of 5

Answer 1

20^2 + 2√5 - 3√5 = 400-√5
Maybe you meant
√20 + 2√5 - 3√5
If so, then since 20=4*5, that is just
2√5 + 2√5 - 3√5 = √5