2x2/5-x1/5-1=0

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Solution for 2x2/5-x1/5-1=0 equation: 


x in (-oo:+oo)

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

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

2/5*x^2-1/5*x-1 = 0

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

DELTA = 41/25

DELTA > 0

x = ((41/25)^(1/2)+1/5)/(2/5*2) or x = (1/5-(41/25)^(1/2))/(2/5*2)

x = 5/4*((41/25)^(1/2)+1/5) or x = 5/4*(1/5-(41/25)^(1/2))

x in { 5/4*(1/5-(41/25)^(1/2)), 5/4*((41/25)^(1/2)+1/5) }

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