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Today at 12:38 PM
Mathematics

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

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

Answer :

MathPhys MathPhys

Today at 12:43 PM

Answer:

1

Step-by-step 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.

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