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OpenStudy (anonymous):
5i(13 - 8i)...I keep getting 65 - 40i
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OpenStudy (espex):
You mean you get 65i+40?
OpenStudy (anonymous):
no, I keep getting 65 - 40i, and I know its wrong but I don't know what I am doing wrong?
OpenStudy (espex):
5i(13-8i) => 65i-40i^2 => i^2 = -1 => 65i-(-1)(40) => 65i+40
OpenStudy (espex):
Is that not the way you are doing it?
OpenStudy (anonymous):
nope. I'm just multiplying 5i by 13, then by 8i
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OpenStudy (espex):
Exactly, so 5i * 13 = 65i 5i * 8i = 40(i^2) i^2 = -1
OpenStudy (anonymous):
oh I see now
OpenStudy (espex):
Glad to hear it.. :)
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