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Math

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A rectangular parking lot is 25 ft. ny 50 ft is increased on all 4 sides by the same amount. The area increased by 400 sq ft. What are the new dimensions of the parking lot?

  • Math -

    (25+L)(50+L)=25*50+400

    25*50+75L+L^2=25*50+400

    L^2+75L-400=0

    l=(-75+-sqrt(75^2+1600))/2=(-75+-85)/2=
    = 5

    new dimensions: 30*55

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