Exercises: Add, Subtract, and Multiply Complex Numbers

Show your work. Write all answers in standard form $a + bi$ .

Grade 9·21 problems·~30 min·Common Core Math - HS Number and Quantity·standard·hsn-cn-a-2

Work through problems with immediate feedback

Warm-Up: Review What You Know

Expand $(2 + 3)(2 - 3)$ using the difference-of-squares pattern $(a + b)(a - b) = a^2 - b^2$ .

$4 + 9 = 13$

$4 - 9 = -5$

$4 - 6 = -2$

$4 + 6 = 10$