Evaluate
x^{2}+8x-15
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x^{2}+8x-15
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2x^{2}+5x-7-x^{2}+3x-8
To find the opposite of x^{2}-3x+8, find the opposite of each term.
x^{2}+5x-7+3x-8
Combine 2x^{2} and -x^{2} to get x^{2}.
x^{2}+8x-7-8
Combine 5x and 3x to get 8x.
x^{2}+8x-15
Subtract 8 from -7 to get -15.
2x^{2}+5x-7-x^{2}+3x-8
To find the opposite of x^{2}-3x+8, find the opposite of each term.
x^{2}+5x-7+3x-8
Combine 2x^{2} and -x^{2} to get x^{2}.
x^{2}+8x-7-8
Combine 5x and 3x to get 8x.
x^{2}+8x-15
Subtract 8 from -7 to get -15.
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