Posted by **Lily** on Wednesday, June 11, 2008 at 5:37pm.

the problem is about adding and subtracting polynomials...

This is what I did...

2x+3+3x+1

=2x+3x+3+1

=5x+4

and

9x+11-5x+4

=9x-5x+11+4

=4x+15

but then, if I add both 5x+4+4x+15

=9x+19...

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