10. For each of the following, find dy/dx: \text { a. } y=4 x^{3}+2 x^{2}-7 x \text { b. } y=(3 x+10)\left(6 x^{2}-7 x\right) \text { c. } y=\left(a x^{2}+b\right)

/(c x+d) \text { d. } y=\left(7 x^{3}-4 x\right)^{8}