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f(x)= 3x^2 -4
f ' (x)= m = 6x
Se toma la abscisa del punto (1, -1)
m= 6(1)= 6
Se obtiene la recta tangente.
(1, -1) ; m= 6
y - y1 = m(x -x1)
y +1 = 6(x -1)
y= 6x -7 => R/.