Evaluate
5\left(80-x\right)\left(x+20\right)
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8000+300x-5x^{2}
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8000+400x-100x-5x^{2}
Apply the distributive property by multiplying each term of 80-x by each term of 100+5x.
8000+300x-5x^{2}
Combine 400x and -100x to get 300x.
8000+400x-100x-5x^{2}
Apply the distributive property by multiplying each term of 80-x by each term of 100+5x.
8000+300x-5x^{2}
Combine 400x and -100x to get 300x.
Examples
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