30-x*x/2=28

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Solution for 30-x*x/2=28 equation: 


x in (-oo:+oo)

30-((x*x)/2) = 28 // - 28

30-((x*x)/2)-28 = 0

(-1/2)*x^2-28+30 = 0

-1/2*x^2 = -2 // : -1/2

x^2 = 4

x^2 = 4 // ^ 1/2

abs(x) = 2

x = 2 or x = -2

x in { 2, -2 }

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