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27 August, 07:43

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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  1. 27 August, 08:00
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    A (x) = (11+x) (7+3x)

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

    A (x) = x^2 + 40x + 77
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