Evaluate the following limits. (a)
\lim_()(x^(3)-x^(2)-6x)/(x^(2)-4x+3)
(3^(3)-3^(2)-6(3))/(3^(2)-4(3)+3)=(-18)/(0)
(b)
\lim_(y->49)(y-49)/(\sqrt(y)-7)
