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