Evaluate
3\left(140-x\right)\left(x-40\right)
Expand
-3x^{2}+540x-16800
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420x-3x^{2}-16800+120x
Apply the distributive property by multiplying each term of x-40 by each term of 420-3x.
540x-3x^{2}-16800
Combine 420x and 120x to get 540x.
420x-3x^{2}-16800+120x
Apply the distributive property by multiplying each term of x-40 by each term of 420-3x.
540x-3x^{2}-16800
Combine 420x and 120x to get 540x.
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