x^4/5-10x^2/5+9=0

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Solution for x^4/5-10x^2/5+9=0 equation: 


x in (-oo:+oo)

(x^4)/5-((10*x^2)/5)+9 = 0

(x^4)/5-2*x^2+9 = 0

1/5*x^4-2*x^2+9 = 0

t_1 = x^2

1/5*t_1^2-2*t_1^1+9 = 0

1/5*t_1^2-2*t_1+9 = 0

DELTA = (-2)^2-(1/5*4*9)

DELTA = -16/5

DELTA < 0

x belongs to the empty set

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