SOLUTION: When adding polynomials, do i add the exponents together also: ex:(x^2+x+1)+(2x-9x^2)=? my answer was: 3x^3-5x^2-5x

Algebra ->  Polynomials-and-rational-expressions -> SOLUTION: When adding polynomials, do i add the exponents together also: ex:(x^2+x+1)+(2x-9x^2)=? my answer was: 3x^3-5x^2-5x      Log On


   

Question 289359: When adding polynomials, do i add the exponents together also:
ex:(x^2+x+1)+(2x-9x^2)=? my answer was: 3x^3-5x^2-5x
Found 2 solutions by Alan3354, richwmiller:
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
When adding polynomials, do i add the exponents together also:
No, you don't.
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ex:(x^2+x+1)+(2x-9x^2)=? my answer was: 3x^3-5x^2-5x
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(x^2+x+1)+(2x-9x^2)
Add x^2 terms --> -8x^2
Add x terms --> 3x
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--> -8x^2 + 3x + 1

Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
not even close.
You add the terms with like exponents.
So 7a^2-3a^2=4a^2