(4t^2/5)+(t/5)=(21/10)

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Solution for (4t^2/5)+(t/5)=(21/10) equation: 


t in (-oo:+oo)

(4*t^2)/5+t/5 = 21/10 // - 21/10

(4*t^2)/5+t/5-(21/10) = 0

(4*t^2)/5+t/5-21/10 = 0

4/5*t^2+1/5*t-21/10 = 0

DELTA = (1/5)^2-(-21/10*4/5*4)

DELTA = 169/25

DELTA > 0

t = ((169/25)^(1/2)-1/5)/(4/5*2) or t = (-(169/25)^(1/2)-1/5)/(4/5*2)

t = 3/2 or t = -7/4

t in { -7/4, 3/2 }

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