PLEASE HELP ASAP!! CORRECT ANSWER ONLY PLEASE!! Simplify. (7 − 2i)(8 + 9i)

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asked Apr 15, 2019 143k views

4 votes

PLEASE HELP ASAP!! CORRECT ANSWER ONLY PLEASE!!

Simplify.

(7 − 2i)(8 + 9i)

Mathematics
high-school

Nepoxx asked

by Nepoxx

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2 Answers

6 votes

Answer:

74+47i

Explanation:

Athrun Zara answered Apr 16, 2019

by Athrun Zara

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6 votes

(7 - 2i)(8 + 9i)

= 7(8 + 9i) + -2i(8 + 9i)

= 56 + 63i + -16i - 18i²

= 56 + 47i +18 (NOTE: i² = -1 → (-18)(-1) = +18)

= 74 + 47i

Answer: 74 + 47i

Nick Whiu answered Apr 21, 2019

by Nick Whiu

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