Question 422265
I will put values sq root2=1.41
1.

3*1.41(8+2.23)                             sq rt 5=2.23

43.27

2.  7*(-2sq root 5 +6)
=   7*(-2*2.23+6)
=7*(1.54)=10.78

3. 2sqrootx-3sqrootx+4sqrootx
add or subtract
(2+4-3)sqroots
3sqrootx