87-x^2=31+5/2x^2

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Solution for 87-x^2=31+5/2x^2 equation: 


x in (-oo:+oo)

87-x^2 = (5/2)*x^2+31 // - (5/2)*x^2+31

87-x^2-((5/2)*x^2)-31 = 0

(-5/2)*x^2-x^2-31+87 = 0

-7/2*x^2 = -56 // : -7/2

x^2 = 16

x^2 = 16 // ^ 1/2

abs(x) = 4

x = 4 or x = -4

x in { 4, -4 }

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