SOLUTION: Subtract and simplify (4-i)-(7+4i) I know that I need to use FOIL but I get the answer all wrong. Can someone help me understand? Thanks, Cassie

Algebra ->  Complex Numbers Imaginary Numbers Solvers and Lesson -> SOLUTION: Subtract and simplify (4-i)-(7+4i) I know that I need to use FOIL but I get the answer all wrong. Can someone help me understand? Thanks, Cassie      Log On


   

Question 747934: Subtract and simplify
(4-i)-(7+4i)
I know that I need to use FOIL but I get the answer all wrong. Can someone help me understand?
Thanks,
Cassie
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
Subtract and simplify
(4-i)-(7+4i)
I know that I need to use FOIL but I get the answer all wrong.
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No, FOIL is used to multiply two binomials.
Yours is a subtraction problem.
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= 4-i-7-4i
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= -3-5i
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Cheers,
Stan H.