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D( a )
a+7 = 0
a+7 = 0
a+7 = 0
a+7 = 0 // - 7
a = -7
a in (-oo:-7) U (-7:+oo)
(a^2+6*a-11)/(a+7) = 0
a^2+6*a-11 = 0
a^2+6*a-11 = 0
DELTA = 6^2-(-11*1*4)
DELTA = 80
DELTA > 0
a = (80^(1/2)-6)/(1*2) or a = (-80^(1/2)-6)/(1*2)
a = (4*5^(1/2)-6)/2 or a = (-4*5^(1/2)-6)/2
(a-((-4*5^(1/2)-6)/2))*(a-((4*5^(1/2)-6)/2)) = 0
((a-((-4*5^(1/2)-6)/2))*(a-((4*5^(1/2)-6)/2)))/(a+7) = 0
( a-((-4*5^(1/2)-6)/2) )
a-((-4*5^(1/2)-6)/2) = 0 // + (-4*5^(1/2)-6)/2
a = (-4*5^(1/2)-6)/2
( a-((4*5^(1/2)-6)/2) )
a-((4*5^(1/2)-6)/2) = 0 // + (4*5^(1/2)-6)/2
a = (4*5^(1/2)-6)/2
a in { (-4*5^(1/2)-6)/2, (4*5^(1/2)-6)/2 }
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