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Algebra 2

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how do I find the length and width of a rectangle when the width of the rectangle is 3 feet less tahn the length. The area is 18ft^2

  • Algebra 2 -

    Here is how to get the answer using algebra.

    L*W = L*(L-3) = 18

    L^2 -3L -18 = 0

    (L+3)(L-6) = 0

    L = 6 or -3

    Take the positive root for L. A negative length does not make sense in this case.

    Then compute W.

  • Algebra 2 -

    what is an expression for an area of an equilateral triangle,A, as a function of its diameter,d?

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