Question

2√20 + √28 - 3√125 + 4√63 - 5√80
Mohon bntuannya....

Answer 1

= 4 + 2 - 15 + 12 - 20
=14-31

Answer 2

= 2√20 + √28 - 3√125 + 4√63 - 5√80
= 2√4.5 + √4.7 - 3√25.5 + 4√9.7 - 5√16.5
= 2 . 2 √5 + 2√7 - 3 . 5 √5 + 4 . 3 √7 - 5 . 4 √5
= 4√5 + 2√7 - 15√5 + 12√7 - 20√5
= 4√5 - 15√5 - 20√5 + 2√7 + 12√7 
= -31√5 + 14√7