Homework Help: Pre Algebra

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...

Pre Algebra - Reiny, Wednesday, June 11, 2008 at 9:56pm
I think this deals with the same problem you posted at 8:49 pm

In this question I think you wanted to subract 5x+4 from 9x+11

that would be 9x+11 - (5x+4)
= 9x + 11 - 5x - 4
= 4x + 7

See how important brackets and the order of operations are ??

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