(5 - 2x + 3x^2 + x^3) - (-2 + x - x^3) Combine like terms, right? 5 and -2 -2x and x 3x^2 x^3 and -x^3 3 -1x + 3x^2 - x^3 Is this right?
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The second group of terms has a minus sign in front. Please recheck your work.
$\displaystyle (5 - 2x + 3x^2 + x^3) - (-2 + x - x^3)$ first remove the brackets by expanding in the minus sign. $\displaystyle 5 - 2x + 3x^2 + x^3+2 - x + x^3$ $\displaystyle 2x^3+ 3x^2- 3x +7$
7 - 3x + 3x^2 + x^3 Okay, that makes sense. I forgot to switch the signs. Is this correct?
Okay, thanks. I wasn't sure if I was supposed to make it 2x or not. Got it.
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