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D( a )
a^2-(4*a)-5 = 0
a^2-(4*a)-5 = 0
a^2-(4*a)-5 = 0
a^2-4*a-5 = 0
a^2-4*a-5 = 0
DELTA = (-4)^2-(-5*1*4)
DELTA = 36
DELTA > 0
a = (36^(1/2)+4)/(1*2) or a = (4-36^(1/2))/(1*2)
a = 5 or a = -1
a in (-oo:-1) U (-1:5) U (5:+oo)
(a^2-(5*a))/(a^2-(4*a)-5) = 0
(a^2-5*a)/(a^2-4*a-5) = 0
a^2-5*a = 0
a*(a-5) = 0
a-5 = 0 // + 5
a = 5
a*(a-5) = 0
a^2-4*a-5 = 0
a^2-4*a-5 = 0
DELTA = (-4)^2-(-5*1*4)
DELTA = 36
DELTA > 0
a = (36^(1/2)+4)/(1*2) or a = (4-36^(1/2))/(1*2)
a = 5 or a = -1
(a+1)*(a-5) = 0
(a*(a-5))/((a+1)*(a-5)) = 0
( a-5 )
a-5 = 0 // + 5
a = 5
( a )
a = 0
a in { 5}
a = 0
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