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7+5x-4x^{2}
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7+5x-4x^{2}
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-3x^{2}+5x-x^{2}+7
To find the opposite of x^{2}-7, find the opposite of each term.
-4x^{2}+5x+7
Combine -3x^{2} and -x^{2} to get -4x^{2}.
-3x^{2}+5x-x^{2}+7
To find the opposite of x^{2}-7, find the opposite of each term.
-4x^{2}+5x+7
Combine -3x^{2} and -x^{2} to get -4x^{2}.
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