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D( a )
a^2-(2*a)-8 = 0
a^2-(2*a)-8 = 0
a^2-(2*a)-8 = 0
a^2-2*a-8 = 0
a^2-2*a-8 = 0
DELTA = (-2)^2-(-8*1*4)
DELTA = 36
DELTA > 0
a = (36^(1/2)+2)/(1*2) or a = (2-36^(1/2))/(1*2)
a = 4 or a = -2
a in (-oo:-2) U (-2:4) U (4:+oo)
(2*a-6)/(a^2-(2*a)-8) = 0
(2*a-6)/(a^2-2*a-8) = 0
a^2-2*a-8 = 0
a^2-2*a-8 = 0
DELTA = (-2)^2-(-8*1*4)
DELTA = 36
DELTA > 0
a = (36^(1/2)+2)/(1*2) or a = (2-36^(1/2))/(1*2)
a = 4 or a = -2
(a+2)*(a-4) = 0
(2*a-6)/((a+2)*(a-4)) = 0
2*a-6 = 0 // + 6
2*a = 6 // : 2
a = 6/2
a = 3
a = 3
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