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    vonna2013's Avatar
    vonna2013 Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Nov 14, 2013, 05:36 PM
    Math question:
    A piece of cardboard is 3 cms longer than it is tall. The area of the piece of cardboard is 70 cms. How many cms tall is the piece of cardboard?
    Scleros's Avatar
    Scleros Posts: 2,165, Reputation: 262
    Hardware Expert
    		  
    #2

    Nov 23, 2013, 05:57 AM
    W+3=L and Area=W*L=70

    So,
    W*L=70, or
    W*(W+3)=70
    W^2+3W=70
    W^2+3W-70=0
    W=-3/2 + SQRT((3/2)^2+70) via quadratic formula
    W=7

    then,
    W+3=L
    7+3=L
    L=10
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