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21x^{2}-29x-12
Evaluate
\left(7x-12\right)\left(3x+1\right)
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21x^{2}+7x-36x-12
Apply the distributive property by multiplying each term of 7x-12 by each term of 3x+1.
21x^{2}-29x-12
Combine 7x and -36x to get -29x.
21x^{2}+7x-36x-12
Apply the distributive property by multiplying each term of 7x-12 by each term of 3x+1.
21x^{2}-29x-12
Combine 7x and -36x to get -29x.
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