300-3x^2/4

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Solution for 300-3x^2/4 equation: 


x in (-oo:+oo)

300-((3*x^2)/4) = 0

(-3/4)*x^2+300 = 0

-3/4*x^2 = -300 // : -3/4

x^2 = 400

x^2 = 400 // ^ 1/2

abs(x) = 20

x = 20 or x = -20

x in { 20, -20 }

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