SOLUTION: how do you begin this... Express the answer in the form a + bi, where a and b are real numbers. I know you use the foil method (3 + 3i) (4 – i)

Algebra ->  Complex Numbers Imaginary Numbers Solvers and Lesson -> SOLUTION: how do you begin this... Express the answer in the form a + bi, where a and b are real numbers. I know you use the foil method (3 + 3i) (4 – i)       Log On


   

Question 329362: how do you begin this... Express the answer in the form a + bi, where a and b are real numbers.
I know you use the foil method
(3 + 3i) (4 – i)
Found 2 solutions by josmiceli, solver91311:
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
%283+%2B+3i%29%284+-+i%29
3%2A4+%2B+4%2A3i+-+3%2Ai+-+3%2Ai%5E2
Note that i%5E2+=+-1
12+%2B+12%2Ai+-+3%2Ai+-+3%2A%28-1%29
12+%2B+9%2Ai+%2B+3
15+%2B+9%2Ai answer

Answer by solver91311(24713) About Me  (Show Source):
You can put this solution on YOUR website!


Exactly. Use FOIL. Just remember that


John

My calculator said it, I believe it, that settles it