Khan/khan-exercises — Issue #12267: Functions 3 - Problem with answer
Author: KhanBugz
Created: 2012-01-27 12:41:28+00:00
State: open
Labels: safari, wrong-or-unclear, xp

Reporter: mrbadylarz@gmail.com

i think that should be -144:

h(12)=-12^2+(-4)(12)+(5)(-48)
h(12)=144-48-240=-144

negative number squared isn't negative: (-12)*(-12)=+144

[functions_3.html?seed=10&problem=0](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/functions_3.html?seed=10&problem=0&debug)

[Answer timeline](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/functions_3.html?seed=10&problem=0&debug&activity=%5B%5B%22incorrect-activity%22%2C%22%5C%22-144%5C%22%22%2C236%5D%2C%5B%22hint-activity%22%2C%220%22%2C3%5D%2C%5B%22hint-activity%22%2C%220%22%2C10%5D%2C%5B%22hint-activity%22%2C%220%22%2C11%5D%2C%5B%22hint-activity%22%2C%220%22%2C11%5D%2C%5B%22hint-activity%22%2C%220%22%2C14%5D%2C%5B%22hint-activity%22%2C%220%22%2C15%5D%2C%5B%22hint-activity%22%2C%220%22%2C17%5D%2C%5B%22hint-activity%22%2C%220%22%2C18%5D%2C%5B%22hint-activity%22%2C%220%22%2C19%5D%2C%5B%22hint-activity%22%2C%220%22%2C29%5D%5D)

["-144"]

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