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D( x )
x^2+2*x+1 = 0
x^2+2*x+1 = 0
x^2+2*x+1 = 0
x^2+2*x+1 = 0
DELTA = 2^2-(1*1*4)
DELTA = 0
x = -2/(1*2)
x = -1 or x = -1
x in (-oo:-1) U (-1:+oo)
(3*x^2-(12*x)-15)/(x^2+2*x+1) = 0
(3*x^2-12*x-15)/(x^2+2*x+1) = 0
3*x^2-12*x-15 = 0
3*(x^2-4*x-5) = 0
x^2-4*x-5 = 0
DELTA = (-4)^2-(-5*1*4)
DELTA = 36
DELTA > 0
x = (36^(1/2)+4)/(1*2) or x = (4-36^(1/2))/(1*2)
x = 5 or x = -1
3*(x+1)*(x-5) = 0
x^2+2*x+1 = 0
x^2+2*x+1 = 0
DELTA = 2^2-(1*1*4)
DELTA = 0
x = -2/(1*2)
x = -1 or x = -1
(x+1)^2 = 0
(3*(x+1)*(x-5))/((x+1)^2) = 0
( x+1 )
x+1 = 0 // - 1
x = -1
( x-5 )
x-5 = 0 // + 5
x = 5
x in { -1}
x = 5
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