Question

40 POINTS NEED HELP FAST(sqrt is a radical)

1.)simplify:
sqrt425
sqrt628
sqrt128

2.)add:
-2sqrt7+3sqrt7

3.)subtract:
-3sqrt12-3sqrt3-3sqrt20

4.)multiply:
3sqrt3(3sqrt8)
3sqrt3(4-3sqrt5)

Answer 1

1)5sqrt17,2sqrt157,8sqrt2

2)sqrt7

3)-3(3sqrt3+2sqrt5)

4)18sqrt6,12sqrt3-9sqrt15