Simplifying Expressions
I am taking algebra in school.
I am having a tough time understanding how to do this.
I am not sure if I am missing something.
For example 3x^2 +x(-5+4) makes no sense to me.
The answer is supposed to be -2x^2 +4x. If I did not have the answer in front of me I would not have gotten it.
I guess I went about it backwards. Can someone explain or suggest a good web page?