Applying the definition of the derivative, [math]d'\left(p\right)=\lim_{h\rightarrow0}[/math][math]\frac{d\left(p+h\right)-d\left(p\right)}{h}[/math], we see [math]d'\left(p\right)=-6x^2-5[/math]. The algebra of this derivative is shown in the [i]Solution[/i] pdf at the end of the page.