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7y^{2}-1
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9y^{2}-1-2y^{2}
To find the opposite of 1+2y^{2}, find the opposite of each term.
7y^{2}-1
Combine 9y^{2} and -2y^{2} to get 7y^{2}.
9y^{2}-1-2y^{2}
To find the opposite of 1+2y^{2}, find the opposite of each term.
7y^{2}-1
Combine 9y^{2} and -2y^{2} to get 7y^{2}.
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