Evaluate
10\left(40-x\right)\left(x+10\right)
Expand
4000+300x-10x^{2}
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4000-100x+400x-10x^{2}
Apply the distributive property by multiplying each term of 10+x by each term of 400-10x.
4000+300x-10x^{2}
Combine -100x and 400x to get 300x.
4000-100x+400x-10x^{2}
Apply the distributive property by multiplying each term of 10+x by each term of 400-10x.
4000+300x-10x^{2}
Combine -100x and 400x to get 300x.
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