Question

1.√20+√125+2√28-4√63=

Answer 1

=√20 + √125 + 2√28 - 4√63
=√4.5 + √25.5 + 2√4.7 - 4√9.7
=(2√5 + 5√5 )+ (2.2√7 - 4.3√7)
=(2√5 + 5√5 ) +(4√7 - 12√7)
= 7√5 + (-8√7)
=7√5 - 8√7