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D( x )
14*x^2-(126*x)+196 = 0
14*x^2-(126*x)+196 = 0
14*x^2-(126*x)+196 = 0
14*x^2-126*x+196 = 0
14*x^2-126*x+196 = 0
DELTA = (-126)^2-(4*14*196)
DELTA = 4900
DELTA > 0
x = (4900^(1/2)+126)/(2*14) or x = (126-4900^(1/2))/(2*14)
x = 7 or x = 2
x in (-oo:2) U (2:7) U (7:+oo)
(81*x-9*x^2-224)/(14*x^2-(126*x)+196) = 0
(81*x-9*x^2-224)/(14*x^2-126*x+196) = 0
81*x-9*x^2-224 = 0
81*x-9*x^2-224 = 0
DELTA = 81^2-(-224*(-9)*4)
DELTA = -1503
DELTA < 0
1 = 0
14*x^2-126*x+196 = 0
14*(x^2-9*x+14) = 0
x^2-9*x+14 = 0
DELTA = (-9)^2-(1*4*14)
DELTA = 25
DELTA > 0
x = (25^(1/2)+9)/(1*2) or x = (9-25^(1/2))/(1*2)
x = 7 or x = 2
14*(x-2)*(x-7) = 0
1/(14*(x-2)*(x-7)) = 0
x belongs to the empty set
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