1/2(z^2-15)

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Solution for 1/2(z^2-15) equation: 


z in (-oo:+oo)

(1/2)*(z^2-15) = 0

1/2*(z^2-15) = 0

1*z^2 = 15 // : 1

z^2 = 15

z^2 = 15 // ^ 1/2

abs(z) = 15^(1/2)

z = 15^(1/2) or z = -15^(1/2)

z in { 15^(1/2), -15^(1/2) }

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