Evaluate
99-3x-12x^{2}
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99-3x-12x^{2}
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9x^{2}+54x+81+\left(-3x-9\right)\left(7x-2\right)
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(-3x-9\right)^{2}.
9x^{2}+54x+81-21x^{2}-57x+18
Use the distributive property to multiply -3x-9 by 7x-2 and combine like terms.
-12x^{2}+54x+81-57x+18
Combine 9x^{2} and -21x^{2} to get -12x^{2}.
-12x^{2}-3x+81+18
Combine 54x and -57x to get -3x.
-12x^{2}-3x+99
Add 81 and 18 to get 99.
9x^{2}+54x+81+\left(-3x-9\right)\left(7x-2\right)
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(-3x-9\right)^{2}.
9x^{2}+54x+81-21x^{2}-57x+18
Use the distributive property to multiply -3x-9 by 7x-2 and combine like terms.
-12x^{2}+54x+81-57x+18
Combine 9x^{2} and -21x^{2} to get -12x^{2}.
-12x^{2}-3x+81+18
Combine 54x and -57x to get -3x.
-12x^{2}-3x+99
Add 81 and 18 to get 99.
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