SOLUTION: Please help with this!
I have to simplify each expression
1. (2+3i)(4+5i)
2.(1 + 2i) (6-3i)
Algebra.Com
Question 527579: Please help with this!
I have to simplify each expression
1. (2+3i)(4+5i)
2.(1 + 2i) (6-3i)
Answer by solver91311(24713) (Show Source): You can put this solution on YOUR website!
Use FOIL just like multiplying any other pair of binomials. Just remember that 
In general:
(c\ +\ di)\ =\ ac\ +\ (ad\ +\ bc)i\ +\ (bd)i^2\ =\ ac\ +\ (ad\ +\ bc)i\ -\ bd\ =\ (ac\ -\ bd)\ +\ (ad\ +\ bc)i)
John
My calculator said it, I believe it, that settles it
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