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20x^{2}+31x-9
Evaluate
\left(4x-1\right)\left(5x+9\right)
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20x^{2}+36x-5x-9
Apply the distributive property by multiplying each term of 4x-1 by each term of 5x+9.
20x^{2}+31x-9
Combine 36x and -5x to get 31x.
20x^{2}+36x-5x-9
Apply the distributive property by multiplying each term of 4x-1 by each term of 5x+9.
20x^{2}+31x-9
Combine 36x and -5x to get 31x.
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