Evaluate
10\left(70-x\right)\left(x-30\right)
Expand
-10x^{2}+1000x-21000
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-10x^{2}+700x+300x-21000
Apply the distributive property by multiplying each term of x-30 by each term of -10x+700.
-10x^{2}+1000x-21000
Combine 700x and 300x to get 1000x.
-10x^{2}+700x+300x-21000
Apply the distributive property by multiplying each term of x-30 by each term of -10x+700.
-10x^{2}+1000x-21000
Combine 700x and 300x to get 1000x.
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