Evaluate
5\left(28-x\right)\left(x+20\right)
Expand
2800+40x-5x^{2}
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2800-100x+140x-5x^{2}
Apply the distributive property by multiplying each term of 100+5x by each term of 28-x.
2800+40x-5x^{2}
Combine -100x and 140x to get 40x.
2800-100x+140x-5x^{2}
Apply the distributive property by multiplying each term of 100+5x by each term of 28-x.
2800+40x-5x^{2}
Combine -100x and 140x to get 40x.
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