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D( x )
x+12 = 0
x+12 = 0
x+12 = 0
x+12 = 0 // - 12
x = -12
x in (-oo:-12) U (-12:+oo)
x = (2*x-16)/(x+12) // - (2*x-16)/(x+12)
x-((2*x-16)/(x+12)) = 0
(-1*(2*x-16))/(x+12)+x = 0
(-1*(2*x-16))/(x+12)+(x*(x+12))/(x+12) = 0
x*(x+12)-1*(2*x-16) = 0
x^2+10*x+16 = 0
x^2+10*x+16 = 0
x^2+10*x+16 = 0
DELTA = 10^2-(1*4*16)
DELTA = 36
DELTA > 0
x = (36^(1/2)-10)/(1*2) or x = (-36^(1/2)-10)/(1*2)
x = -2 or x = -8
(x+8)*(x+2) = 0
((x+8)*(x+2))/(x+12) = 0
((x+8)*(x+2))/(x+12) = 0 // * x+12
(x+8)*(x+2) = 0
( x+2 )
x+2 = 0 // - 2
x = -2
( x+8 )
x+8 = 0 // - 8
x = -8
x in { -2, -8 }
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