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94400+13600x-400x^{2}
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94400+13600x-400x^{2}
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96000+16000x-2400x-400x^{2}-1600
Apply the distributive property by multiplying each term of 80-2x by each term of 1200+200x.
96000+13600x-400x^{2}-1600
Combine 16000x and -2400x to get 13600x.
94400+13600x-400x^{2}
Subtract 1600 from 96000 to get 94400.
96000+16000x-2400x-400x^{2}-1600
Apply the distributive property by multiplying each term of 80-2x by each term of 1200+200x.
96000+13600x-400x^{2}-1600
Combine 16000x and -2400x to get 13600x.
94400+13600x-400x^{2}
Subtract 1600 from 96000 to get 94400.
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