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18-45x-27x^{2}
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18-45x-27x^{2}
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-21x^{2}-42x+12x+24+\left(-3x-6\right)\left(2x+1\right)
Apply the distributive property by multiplying each term of 7x-4 by each term of -3x-6.
-21x^{2}-30x+24+\left(-3x-6\right)\left(2x+1\right)
Combine -42x and 12x to get -30x.
-21x^{2}-30x+24-6x^{2}-3x-12x-6
Apply the distributive property by multiplying each term of -3x-6 by each term of 2x+1.
-21x^{2}-30x+24-6x^{2}-15x-6
Combine -3x and -12x to get -15x.
-27x^{2}-30x+24-15x-6
Combine -21x^{2} and -6x^{2} to get -27x^{2}.
-27x^{2}-45x+24-6
Combine -30x and -15x to get -45x.
-27x^{2}-45x+18
Subtract 6 from 24 to get 18.
-21x^{2}-42x+12x+24+\left(-3x-6\right)\left(2x+1\right)
Apply the distributive property by multiplying each term of 7x-4 by each term of -3x-6.
-21x^{2}-30x+24+\left(-3x-6\right)\left(2x+1\right)
Combine -42x and 12x to get -30x.
-21x^{2}-30x+24-6x^{2}-3x-12x-6
Apply the distributive property by multiplying each term of -3x-6 by each term of 2x+1.
-21x^{2}-30x+24-6x^{2}-15x-6
Combine -3x and -12x to get -15x.
-27x^{2}-30x+24-15x-6
Combine -21x^{2} and -6x^{2} to get -27x^{2}.
-27x^{2}-45x+24-6
Combine -30x and -15x to get -45x.
-27x^{2}-45x+18
Subtract 6 from 24 to get 18.
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