Question
From, $7+x-x^2$, take away $9+x+3 x^2+7 x^3$
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Answer
Required expression:
$=\left(7+x-x^2\right)-\left(9+x+3 x^2+7 x^3\right)$
$=7+x-x^2-9-x-3 x^2-7 x^3$
$=-7 x^3-x^2-3 x^2+7-9$
$=-7 x^3-4 x^2-2$
$=\left(7+x-x^2\right)-\left(9+x+3 x^2+7 x^3\right)$
$=7+x-x^2-9-x-3 x^2-7 x^3$
$=-7 x^3-x^2-3 x^2+7-9$
$=-7 x^3-4 x^2-2$
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