Simplify (9-7i) (11+8i)

Question

Mathematics

Paul Harper

10 November, 13:10

Simplify (9-7i) (11+8i)

+2

Answers (2)

Know the Answer?

Walker Rose · Answer 1

According to WolframAlpha, the answer is 155 - 5i

Glenn · Answer 2

Usually in these kinds of question I like to keep the variables in front, but that's just my thing so it's your call whether you want to do it or not.

(9 - 7i) (11 + 8i) = (-7i + 9) (8i + 11)

Multiply:

(-56i^2 + - 77i) + (72i + 99) = - 56i^2 - 5i + 99