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solve the following equation by completing square

x(square) + 5x - 84
Pls show steps
x= or x=

  • maths -

    x^2 + 5x - 84 = 0
    x^2 + 5x + (5/2)^2 - 84 - (5/2)^2 = 0
    (x + 5/2)^2 = 361/4
    x + 5/2 = ±19/2
    x = -5/2 ± 19/2
    x = -12, 7

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