Question

.

Answer 1

=(sqrt4sqrt5+sqrt9sqrt7)^2
=(sqrt20+sqrt63)^2
=20+2*sqrt20*sqrt63+63
=83+sqrt4sqrt20sqrt63
=83+sqrt5040

Answer 2

=83+sqrt2*2*2*2*3*3*5*7
=83+sqrt12*12*5*7
=83+12*sqrt35

Answer 3

don't forget the (), but yes

Answer 4

No, () in the beginning, but you got the right answer