# Differentiation

**Question**

Find out the derivative of the following functions.

- y = 3x
- y = x
^{3} - y = 1

**Answer**

- 3
- 3x
^{2} - 0

*Notes:*

*Constant Rule*

*y = k (k is a constant)*

*dy/dx = 0*

*Constant Multiple Rule*

*y = kx ^{n} (k & n are both constant)*

*dy/dx = knx*

^{n-1}*Sum Rule*

*y = f(x) + g(x)*

*dy/dx = f'(x) + g'(x)*

*Power rule*

*y = x ^{n}*

*dy/dx = nx*

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