\text { What is the value of } \frac{d}{d x}\left(5 x^{2}+3\right) \text { when } x=3 \text { What is the value of } x \text { when } \frac{d}{d x}\left(\frac{x^{3}}{3}-\frac{x^{2}}{2}-6 x+5\right)=0

Fig: 1

Fig: 2