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9-8a-2a^{2}
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9-8a-2a^{2}
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\left(9+a\right)\left(1-a\right)-a^{2}
Multiply a and a to get a^{2}.
9-9a+a-a^{2}-a^{2}
Apply the distributive property by multiplying each term of 9+a by each term of 1-a.
9-8a-a^{2}-a^{2}
Combine -9a and a to get -8a.
9-8a-2a^{2}
Combine -a^{2} and -a^{2} to get -2a^{2}.
\left(9+a\right)\left(1-a\right)-a^{2}
Multiply a and a to get a^{2}.
9-9a+a-a^{2}-a^{2}
Apply the distributive property by multiplying each term of 9+a by each term of 1-a.
9-8a-a^{2}-a^{2}
Combine -9a and a to get -8a.
9-8a-2a^{2}
Combine -a^{2} and -a^{2} to get -2a^{2}.
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