## Differentiation

The value of a function changes when one of the variables (x, y, a, or b etc) changes. It may change like the variable, (both doubling) or it may change more, or less. Differentiation means finding the derivative of an expression.

This means you are finding a rate of change for a variable. It expresses the slope of the curve.

The derivative of velocity with respect to time is acceleration. If you map the profit of a company over time, the derivative will tell you if the company is getting stronger, levelling off or heading backwards.

Review these sections to learn about this field of mathematics