help PLEASE! URGENT!

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ok, i need help w/ this problem.
(4x^3 + x^2 + 3) + (x^3 + 2x^2 +1)
can u please explain how to do this please? i'm very lost. Thanx!
-Ally

whoops, sorry i didn't mean to post twice!

gather like terms..

(4x^3 + x^3)+(x^2 + 2x^2) +(3+1)....

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