algebra

The length of a rectangle is 7 yd more than double the width, and the area of the rectangle is 99 yd^2. find the dimensions of the rectangle.

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  1. width --- x
    length = 2x+7

    x(2x+7) = 99
    2x^2 + 7x - 99 = 0

    Solve for x using your favourite method, reject the negative answer

    hint: the solution is a rational number

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    Reiny
  2. L= 2w+7 (equation for length width would just be w)
    A= 99 yd^2 (what you are given)
    A= LW (Equation for area)
    99= W(2W+7) (substitution)
    99= 2W^2+7W (distributed)
    2W^2+7w-99 (factor out)
    (2W-11)(W+9)
    W= 11/2, -9 (rectangle can't have - dimensions so 11/2)
    L=2(11/2)+7 = 18
    L=18 and W= 11/2

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  3. Width = W.
    Length = 2W + 7

    W*(2W+7) = 99.
    2w^2 + 7w - 99 = 0,
    Use Quadratic formula to find W.
    W = (-7 +- sqrt(49 + 792))/4 = 5.5, and -9 yds. Use the positive value.

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