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D( x )
3*x^2-(18*x)-48 = 0
3*x^2-(18*x)-48 = 0
3*x^2-(18*x)-48 = 0
3*x^2-18*x-48 = 0
3*x^2-18*x-48 = 0
DELTA = (-18)^2-(-48*3*4)
DELTA = 900
DELTA > 0
x = (900^(1/2)+18)/(2*3) or x = (18-900^(1/2))/(2*3)
x = 8 or x = -2
x in (-oo:-2) U (-2:8) U (8:+oo)
(x^2-(5*x)-14)/(3*x^2-(18*x)-48) = 0
(x^2-5*x-14)/(3*x^2-18*x-48) = 0
x^2-5*x-14 = 0
x^2-5*x-14 = 0
DELTA = (-5)^2-(-14*1*4)
DELTA = 81
DELTA > 0
x = (81^(1/2)+5)/(1*2) or x = (5-81^(1/2))/(1*2)
x = 7 or x = -2
(x+2)*(x-7) = 0
3*x^2-18*x-48 = 0
3*(x^2-6*x-16) = 0
x^2-6*x-16 = 0
DELTA = (-6)^2-(-16*1*4)
DELTA = 100
DELTA > 0
x = (100^(1/2)+6)/(1*2) or x = (6-100^(1/2))/(1*2)
x = 8 or x = -2
3*(x+2)*(x-8) = 0
((x+2)*(x-7))/(3*(x+2)*(x-8)) = 0
( x+2 )
x+2 = 0 // - 2
x = -2
( x-7 )
x-7 = 0 // + 7
x = 7
x in { -2}
x = 7
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