[RESOLVED] Simplifying Expressions

[mykaltx]

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?

[penagate]

3x² + x(-5+4)
= 3x² -5x + 4x
= 3x² - x

which does not equal

4x - 2x²

Unless I misread your post.

[mykaltx]

on math.com come under simplifying expresions it says it does.
I am confused.

[zaza]

Hi,

Are you sure you don't mean:

3x^2 + x(-5x +4)?

That would give the answer you quote, and make more sense than having a (-5+4) in brackets.

zaza

[NotLKH]

Is this the right link mykaltx?
http://www.math.com/school/subject2/...U2L5Pract.html

If so, it just shows zaza right yet again!


-Lou

[mykaltx]

That would be correct.
I got it from math.com