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If 125x = 2010 find x



Dicussion (1)

  • 125x = 20
    1xX2 + 2xX1 + 5xX0 = 20
    X2 + 2X + 5 = 20
    X2 + 2X - 15 = 0
    (X + 5)( X - 3) = 0
    X + 5 implies X = -5
    X - 3 implies X = 3
    But X cannot be negative
    X = 3

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