Simplify

Question

sqrt80 -3 Sqrt63 - sqrt125 - sqrt175

Answer 1

√80 = √16√5 = 4√5
3√63 = 3*√9√7 = 3*3√7 = 9√7
√125 = √25√5 = 5√5
√175 = √25√7 = 5√7

so, you have

4√5-9√7-5√5-5√7 = -√5 - 14√7

Answer 2

√80 - 3√63 - √125 - √175
=√16√5 - 3√9√7 + √25√5 - √25√7
= 4√5 - 9√7 + 5√5 - 5√7
= 9√5 - 14√7

Answer 3

Argghh, messed up a sign
Steve is right