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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???

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# Please help: Expressions do not seem equal!

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