Question

#20 I’m not sure how to solve it. And the answer should be able to grid in like on the SAT

Answer 1

1

Explanation:

i (a + bi) = 1

ai + b(-1) = 1

ai − b = 1

Match the coefficients.

ai = 0

-b = 1

Therefore, a = 0 and b = -1.

So a − b = 0 − (-1) = 1.