Khan/khan-exercises — Issue #13774: Functions 3 - Functions 3
Author: KhanBugz
Created: 2012-02-14 02:54:45+00:00
State: open
Labels: ie8, wrong-or-unclear, xp

Reporter: nella535@aol.com

g(f(1))=

In this problem I need to solve
-1^2 + (4)(1)

-1^2 is technically -1 times -1 and a negative times a negative is a positive, or at least this is what I think. So -1 times -1 equals 1. So the equation becomes 1 + 4 which is 5. But the Kahn excercise says -1 times -1 = -1 which makes the equation -1 + 4 = 3.

Could you please explain? Am I doing this wrong?

[functions_3.html?seed=136&problem=1](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/functions_3.html?seed=136&problem=1&debug)

[Answer timeline](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/functions_3.html?seed=136&problem=1&debug&activity=%5B%5B%22incorrect-activity%22%2C%22%5C%22-19%5C%22%22%2C470%5D%2C%5B%22hint-activity%22%2C%220%22%2C5%5D%2C%5B%22hint-activity%22%2C%220%22%2C7%5D%2C%5B%22hint-activity%22%2C%220%22%2C8%5D%2C%5B%22hint-activity%22%2C%220%22%2C9%5D%2C%5B%22hint-activity%22%2C%220%22%2C10%5D%2C%5B%22hint-activity%22%2C%220%22%2C54%5D%2C%5B%22hint-activity%22%2C%220%22%2C55%5D%5D)

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