(Solved): Calculate the difference quotient for f(x)=5x2 at a=3. (Express numbers in exact form. Use symbo ...

Calculate the difference quotient for $f(x)=5?x^2$ at $a=3$. (Express numbers in exact form. Use symbolic notation and fractions where needed.) $\frac{f(x)?f(3)}{x?3}=$ Calculate $f^{?}(3)$ by finding ${\lim }_{x?3}\frac{f(x)?f(3)}{x?3}$. (Give an exact answer. Use symbolic notation and fractions where needed.) $f^{?}(3)$ Find an equation of the tangent line to $f(x)$ at $a=3$. (Express numbers in exact form. Use symbolic notation and fractions where needed. Let $f(x)=y$ and express equation in terms of $x$ and $y$.)