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Leno4ka [110]
3 years ago
7

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

Mathematics
1 answer:
r-ruslan [8.4K]3 years ago
4 0

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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