a+2/a-4

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Solution for a+2/a-4 equation: 


D( a )

a = 0

a = 0

a = 0

a in (-oo:0) U (0:+oo)

a+2/a-4 = 0

1*a^1+2*a^-1-4*a^0 = 0

(1*a^2-4*a^1+2*a^0)/(a^1) = 0 // * a^2

a^1*(1*a^2-4*a^1+2*a^0) = 0

a^1

a^2-4*a+2 = 0

a^2-4*a+2 = 0

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

DELTA = 16-8

DELTA = 8

DELTA > 0

a = ((16-8)^(1/2)+4)/(1*2) or a = (4-(16-8)^(1/2))/(1*2)

a = ((16-8)^(1/2)+4)/2 or a = (4-(16-8)^(1/2))/2

a in { (4-(16-8)^(1/2))/2, ((16-8)^(1/2)+4)/2} 

a in { (4-(16-8)^(1/2))/2, ((16-8)^(1/2)+4)/2 }

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