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18 January, 07:20

The area of a rectangular painting is given by the trinomial x2 + 4x - 21. What are the possible dimensions of the painting? Use factoring.

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  1. 18 January, 10:05
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    To find the dimensions you can just factor the equation ...

    x^2+4x-21

    x^2-3x+7x-21

    x (x-3) + 7 (x-3)

    (x+7) (x-3) and this is equal to LW or WL

    And note that x>3 for any possible solution.
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