Where to get algebraic help?
June 17, 2014 8:01 PM Subscribe
I am working through the mooculus calculus one mooc
as a refresher (which I clearly need), and there is one thing I have run across that I just don't see. Can you help me figure out what is going on, and what I can do to work out future problems?
In the video on Inverses of Functions, at about 7:00
posted by carpographer to Science & Nature (5 answers total) 2 users marked this as a favorite
, the professor simplifies:
(6 +/- sqrt(6^2 - 4(-12 + h/5))/2
3 +/- sqrt(9 + 12 -h/5)
and I just can't see how that is done. What is confusing me is the term "+12 - h/5" in the simplified square root. It seems to be off by a factor of two, since the -4/2 = -2, not -1. What am I missing in this case?
In addition, I am going to be working through this over the next weeks and have no doubt I will run into similar problems. Is there a website or software that will perform this type of simplification and show the steps? I have access to Matlab and Mathematica, but have never used them, if they help.