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07-07-2017
Mathematics

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A rectangle has a length of 11 inches and a width of 7 inches. If the length is increased by xx inches and the width increased by three times that amount, express the area of the rectangle as a function of x.
A(x)=??

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Аноним Аноним

07-07-2017

A(x) = (11+x)(7+3x)
A(x) = 77 + 33x + 7x + 3x^2
A(x) = x^2 + 40x + 77

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