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math

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the length of a car park is 120 m. longer than its width the area of the car park is 6400 m(2) how would you represents its width

  • math -

    I would let the width = x
    then the length is x+120
    and

    x(x+120) = 6400
    x^2 + 120x - 6400 = 0
    which factors to
    (x-40)(x+ 160) = 0
    x =40 or x = -160, which is not possible, can't have negative width

    width is 40, length is 40+120 = 160

    check: area = 40(160) = 6400 , yup!!

  • math -

    the length of a car park is 120 in longer than its width the area of the car park is 6400m

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