1/5x^2-21/25x-4/5

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Solution for 1/5x^2-21/25x-4/5 equation: 


x in (-oo:+oo)

(1/5)*x^2-((21/25)*x)-(4/5) = 0

(1/5)*x^2+(-21/25)*x-4/5 = 0

1/5*x^2-21/25*x-4/5 = 0

DELTA = (-21/25)^2-(-4/5*1/5*4)

DELTA = 841/625

DELTA > 0

x = ((841/625)^(1/2)+21/25)/(1/5*2) or x = (21/25-(841/625)^(1/2))/(1/5*2)

x = 5 or x = -4/5

x in { -4/5, 5 }

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