a+12/a=7

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Solution for a+12/a=7 equation: 


D( a )

a = 0

a = 0

a = 0

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

a+12/a = 7 // - 7

a+12/a-7 = 0

1*a^1+12*a^-1-7*a^0 = 0

(1*a^2-7*a^1+12*a^0)/(a^1) = 0 // * a^2

a^1*(1*a^2-7*a^1+12*a^0) = 0

a^1

a^2-7*a+12 = 0

a^2-7*a+12 = 0

DELTA = (-7)^2-(1*4*12)

DELTA = 1

DELTA > 0

a = (1^(1/2)+7)/(1*2) or a = (7-1^(1/2))/(1*2)

a = 4 or a = 3

a in { 3, 4} 

a in { 3, 4 }

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