Evaluate
2\left(20-x\right)\left(x-8\right)
Expand
-2x^{2}+56x-320
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\left(x-8\right)\left(40-2x\right)
Add 20 and 20 to get 40.
40x-2x^{2}-320+16x
Apply the distributive property by multiplying each term of x-8 by each term of 40-2x.
56x-2x^{2}-320
Combine 40x and 16x to get 56x.
\left(x-8\right)\left(40-2x\right)
Add 20 and 20 to get 40.
40x-2x^{2}-320+16x
Apply the distributive property by multiplying each term of x-8 by each term of 40-2x.
56x-2x^{2}-320
Combine 40x and 16x to get 56x.
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