Evaluate
\left(260-x\right)\left(x-40\right)
Expand
-x^{2}+300x-10400
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260x-x^{2}-10400+40x
Apply the distributive property by multiplying each term of x-40 by each term of 260-x.
300x-x^{2}-10400
Combine 260x and 40x to get 300x.
260x-x^{2}-10400+40x
Apply the distributive property by multiplying each term of x-40 by each term of 260-x.
300x-x^{2}-10400
Combine 260x and 40x to get 300x.
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