SOLUTION: 1. (4+2i) (1-5i) a. Use foil to multiply the complex numbers. show work. b. combine any like terms from step 1. show work.

Algebra ->  Polynomials-and-rational-expressions -> SOLUTION: 1. (4+2i) (1-5i) a. Use foil to multiply the complex numbers. show work. b. combine any like terms from step 1. show work.      Log On


   

Question 552527: 1. (4+2i) (1-5i)
a. Use foil to multiply the complex numbers. show work.
b. combine any like terms from step 1. show work.
Found 2 solutions by stanbon, Alan3354:
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
1. (4+2i) (1-5i)
a. Use foil to multiply the complex numbers. show work.
F: 4*1 = 4
O: 4*-5i = -20i
I: 2i*1 = 2i
L: 2i*-5i = 10
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b. combine any like terms from step 1. show work.
Combine to get: 14 - 18i
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Cheers,
Stan H.
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Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
(4+2i) (1-5i)
= 4(1-5i) + 2i*(1-5i)
= 4-20i+%2B+2i-10i%5E2
i%5E2+=+-1
= 4 - 18i -10*(-1)
= 4 - 18i + 10
= 14 - 18i