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31 January, 16:10

David wants to hang a mirror in his room. The mirror and frame must have an area of 8 square feet. The mirror is 2 feet wide and 3 feet long. Which quadratic equation can be used to determine the thickness of the frame, x?

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  1. 31 January, 17:42
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    4x^2+10x-2=0

    Step-by-step explanation:

    So the total area of mirror: 2*3 = 6 ft sq

    8-6 = 2 ft sq is the area of the frame

    x is the thickness of the frame

    so we have (2*x) * 2 + (3*x) * 2+x*x*4 = 2

    4x+6x+4x^2=2

    -> 4x^2+10x-2=0
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