### Home > CCA2 > Chapter 9 > Lesson 9.2.1 > Problem 9-57

9-57.

If

*a*= 2 + 3*i*and*b*= 1 −*i*, compute each of the following operations: Homework Help ✎*a*+*b**a*−*b**ab*

(2 + 3*i*) + (1 − *i*)

Combine like terms.

1 + 4*i*

Did you remember to distribute the negative?

A generic rectangle can be used to multiply.

Remeber that *i*^{2} = −1.

Multiply both the numerator and denominator by the complex conjugate of the denominator.