(3-4i)(2+6i)
2006-10-18 09:47:15 · 5 answers · asked by megcheeker 1 in Education & Reference ➔ Homework Help
That's impossible... through FOIL method, the answer should be
-24i^2 +10i +6
2006-10-18 09:53:38 · answer #1 · answered by lebanese_gentleman2005 2 · 0⤊ 2⤋
Foil like you would foil any binomial. First number times first number, outside number times outside number, inside number times inside number and last number times last number....so you multiply 3x2 and get 6, multiply 3 x 6i and get 18i, multiply -4i x 2 and get -8i and -4i x 6i and get -24i^2.
Now combine like terms 6 + 18i - 8i - 24i^2. i^2 has a value of -1. So you are combining 6 + 18i - 8i - 24(-1). Your answer will be 6+24+10i or 30 + 10i.
2006-10-18 10:01:58 · answer #2 · answered by Dana B 1 · 0⤊ 0⤋
6+10i-24i^2
2006-10-18 09:55:19 · answer #3 · answered by jack_daniels 5 · 0⤊ 0⤋
use foil and get.... 6+18i-8i-24i^2.....combine....6+10i+24 (cause i^2=-1) combine again 30+10i
2006-10-18 09:52:04 · answer #4 · answered by who be boo? 5 · 2⤊ 0⤋
i = sqrt(-1)
i * i = sqrt(-1) * sqrt(-1) = -1
That's pretty much all you need to know. Multiply as you would normal polynomials.
2006-10-18 09:50:37 · answer #5 · answered by J C 3 · 1⤊ 0⤋