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.

Answer 1

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.