Question

Simplify the expression 2 square root 20 - 3 square root 7 - 2 square root 5 + 4 square root 63

Answer 1

2 sqrt 20 - 3 sqrt 7 - 2 sqrt 5 + 4 sqrt 63

= 2 sqrt4 sqrt 5 - 3 sqrt 7 - 2 sqrt 5 + 4 sqrt 9 sqrt 7

=  4 sqrt 5  - 2 sqrt 5 + 12 sqrt 7 - 3 sqrt 7

= 2 sqrt 5 +  9 sqrt 7 (answer)