Khan/khan-exercises — Issue #13637: Functions 3 - Possible order-of-operations error?
Author: KhanBugz
Created: 2012-02-11 16:33:42+00:00
State: open
Labels: firefox, wrong-or-unclear, xp

Reporter: spockjr@spockjr.com

Hi, I think I see an ord-of-ops error here. If f(x)= -x^2 - 7x, shouldn't 7x be calculated before the subtraction? The show-steps equates that to (-x^2) + (-7)(x). Please e-mail me if I've misunderstood.

[functions_3.html?seed=47&problem=1](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/functions_3.html?seed=47&problem=1&debug)

[Answer timeline](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/functions_3.html?seed=47&problem=1&debug&activity=%5B%5B%22incorrect-activity%22%2C%22%5C%2210%5C%22%22%2C563%5D%2C%5B%22incorrect-activity%22%2C%22%5C%2218%5C%22%22%2C5%5D%2C%5B%22hint-activity%22%2C%220%22%2C2%5D%2C%5B%22hint-activity%22%2C%220%22%2C3%5D%2C%5B%22hint-activity%22%2C%220%22%2C29%5D%2C%5B%22hint-activity%22%2C%220%22%2C32%5D%2C%5B%22hint-activity%22%2C%220%22%2C50%5D%5D)

["10","18"]

Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2.24) Gecko/20111103 Firefox/3.6.24 ( .NET CLR 3.5.30729; .NET4.0E)

MathJax is loaded, ready, queue length: 0