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3 years ago

#11 HELP PLZZZZZZZZZZZZZZZZ

Mathematics

2 answers:

Lelu [443]3 years ago

6 0

(a + 4i)(9 - bi) Substitute a = 6
(6 + 4i)(9 - bi) Remove the brackets with a foil.
54 - 6*bi + 36i - 4bi^2 Simplify
54 - 6bi +36i + 4b

The only way this can be a real number is if the is disappear. so
-6bi + 36i = 0
-6bi = - 36i Divide by -6i
b = 6

C <<<< answer

ArbitrLikvidat [17]3 years ago

4 0

I wanna say B=4 im like 99% sure

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