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22 May, 19:43

The length of a rectangle is the sum of the width and 4. The area of the rectangle is 32 units. What is the width, in units, of the rectangle?

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  1. 22 May, 19:58
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    b=4

    Step-by-step explanation:

    Lets a be lenght and b width. From text we have:

    a=b+4

    a*b=32

    Put the first equation in the 2n, we get:

    (b+4) b=32

    b^2+4b-32=0

    b^2+8b-4b-32=0

    b (b+8) - 4 (b+8) = 0

    (b+8) (b-4) = 0

    So it must be b=-8 or b=4. We know that width cannot be negative, so it is 4.
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