In order to see the problem here, you need to refer to following link:(adsbygoogle = window.adsbygoogle || []).push({});

http://img.photobucket.com/albums/v224/TurbineSpeed/Picture402887.jpg [Broken]

I understand how they got the expression in the numerator. What I cannot figure out is how they got the denominator.

By their math, (x-4)(x+1) + (x+1)(x-4) = (x+1)(x-4)

This does not seem correct. Give a value to x such as x = 6, and:

(2)(7) + (7)(2) = 14 + 14 = 28

Now if we apply this value to the right member, we get:

(7)(2) = 14.

14 is NOT equal to 28.

What am I doing wrong???

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Please help: Expressions do not seem equal!

**Physics Forums | Science Articles, Homework Help, Discussion**