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solve the following equation by completing the square

x(square) -13x + 21 = 0

Then x= or x=

  • maths -

    x^2-13x+21 = 0
    x^2-13x+(13/2)^2 + 21 - (13/2)^2 = 0
    (x - 13/2)^2 - 85/4 = 0
    x - 13/2)^2 = 85/4
    x - 13/2 = ±√85/2
    x = (13±√85)/2

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