3) \frac{7x^3-21x^2}{3x^2-21x+36}" alt="lim(x->3) \frac{7x^3-21x^2}{3x^2-21x+36}" align="absmiddle" class="latex-formula">
3) \frac{7x^3-21x^2}{3x^2-21x+36}" alt="lim(x->3) \frac{7x^3-21x^2}{3x^2-21x+36}" align="absmiddle" class="latex-formula">