I Ixnay New member Joined Nov 7, 2006 Messages 2 Nov 7, 2006 #1 (-6i + 2) (7+3i) I foil it out to -42i - 18i2 +14+6i Does a negative i squared turn out to be a positive number? because i squared is equal to -1. If I do that it solves out to be -36i + 32 which is marked wrong. He wrote on my paper: -6i+14+6i

(-6i + 2) (7+3i) I foil it out to -42i - 18i2 +14+6i Does a negative i squared turn out to be a positive number? because i squared is equal to -1. If I do that it solves out to be -36i + 32 which is marked wrong. He wrote on my paper: -6i+14+6i

G galactus Super Moderator Staff member Joined Sep 28, 2005 Messages 7,216 Nov 7, 2006 #2 \(\displaystyle \L\\18+14-42\imath+6\imath\) \(\displaystyle \L\\32-36\imath\) is the answer I get.

D Denis Senior Member Joined Feb 17, 2004 Messages 1,446 Nov 7, 2006 #3 Your teacher gave answer for: -6i + 2(7 + 3i); must have been drunk :shock:

S soroban Elite Member Joined Jan 28, 2005 Messages 5,588 Nov 8, 2006 #4 Ixnay said: \(\displaystyle (-6i\,+\,2)(7\,+\,3i)\) He wrote on my paper: -6i + 14 + 6i . . . are you sure? Click to expand... Maybe your teacher is from Gamma Hydra IV . . where the rules of math change on alternate Tuesdays.

Ixnay said: \(\displaystyle (-6i\,+\,2)(7\,+\,3i)\) He wrote on my paper: -6i + 14 + 6i . . . are you sure? Click to expand... Maybe your teacher is from Gamma Hydra IV . . where the rules of math change on alternate Tuesdays.