posted by Kim .
Perform the addition or subtraction and write the result in standard form. (8+sqrt -18) - (4+3sqrt2i) I know that you have to subtract 8 from 4 but I do not know what to do after this.
sqrt (-18) = sqrt(-1*9*2) = 3 i sqrt2
The two imaginary parts cancel out when you subtract, and you are left with just 8 - 4 = 4.