Posted by **laura** on Friday, November 14, 2008 at 8:33pm.

please help me out here the problem is combining like terms.

4x^3-3x^3+9x+2x

I got 1x^3+11x

but when i asked a friend they said it would be x^3+11x

could u help me out please.

also could you tell me if this probem is correct as well (10x^3+6x^2+4x) -(8x^3+2x^2-3x)= 18x^3+4x^2+3x+4

- math -
**Reiny**, Friday, November 14, 2008 at 8:40pm
you are both correct

1x^3+11x is the same as x^3+11x

a coefficient of 1 in front of a variable does not have to be written.

so 1a = a

as to your second question

(10x^3+6x^2+4x) -(8x^3+2x^2-3x)

= 10x^3+6x^2+4x-8x^3-2x^2+3x

= x^3 + 4x^2 + 7x

- math -
**Noether**, Friday, November 14, 2008 at 8:41pm
x^3 and 1x^3 are the same thing. The coefficient is just usually left off when it's a 1.

As for the second problem, your answer isn't quite right. Recheck your x^3 and x terms; there should also be no constant term.

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