(-4x^2+1)*5/4

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x in (-oo:+oo)

(5*(1-4*x^2))/4 = 0

-4*x^2 = -1 // : -4

x^2 = 1/4

x^2 = 1/4 // ^ 1/2

abs(x) = 1/2

x = 1/2 or x = -1/2

x in { 1/2, -1/2 }