(2a-4/a-4)+(-a/a-4)

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Solution for (2a-4/a-4)+(-a/a-4) equation: 


D( a )

a = 0

a = 0

a = 0

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

2*a-(4/a)-a/a-4-4 = 0

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

2*a^1-4*a^-1-9*a^0 = 0

(2*a^2-9*a^1-4*a^0)/(a^1) = 0 // * a^2

a^1*(2*a^2-9*a^1-4*a^0) = 0

a^1

2*a^2-9*a-4 = 0

2*a^2-9*a-4 = 0

DELTA = (-9)^2-(-4*2*4)

DELTA = 113

DELTA > 0

a = (113^(1/2)+9)/(2*2) or a = (9-113^(1/2))/(2*2)

a = (113^(1/2)+9)/4 or a = (9-113^(1/2))/4

a in { (9-113^(1/2))/4, (113^(1/2)+9)/4} 

a in { (9-113^(1/2))/4, (113^(1/2)+9)/4 }

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