SOLUTION: Hello, how do i simplify (9 - 5i)(1 + 3i)

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Question 90415: Hello, how do i simplify (9 - 5i)(1 + 3i)
Found 2 solutions by jim_thompson5910, checkley75:
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
Start with the given expression

Foil

Multiply

Evaluate i%5E2 to get -1

Multiply

Combine like terms. So it is now in a%2Bbi form where a=24 and b=22

Answer by checkley75(3666) About Me  (Show Source):
You can put this solution on YOUR website!
(9-5i)(1+3i)
9-5i+3i-15i^2 (i=SQRT-1 THEREFORE i^2=-1). THEN
9-2i+15
24-2i
2(12-i) ANSWER.