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math

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2x^2+x-28=0
Solve by completing the square

  • math - ,

    2x^2+x = 28
    divide by 2
    x^2 + x/2 = 14
    add 1/16 to both sides
    x^2 + x/2 + 1/16 = 14 + 1/16
    x+1/4)^2 = 225/16
    x + 1/4 = ± 15/4
    x = -1/4 ± 15/4 = 7/2 or -4

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