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3x^{2}+20x-7
Evaluate
\left(3x-1\right)\left(x+7\right)
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3x^{2}+21x-x-7
Apply the distributive property by multiplying each term of 3x-1 by each term of x+7.
3x^{2}+20x-7
Combine 21x and -x to get 20x.
3x^{2}+21x-x-7
Apply the distributive property by multiplying each term of 3x-1 by each term of x+7.
3x^{2}+20x-7
Combine 21x and -x to get 20x.
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