### Functions: Domain and range

### Function rule

We have just seen that a function can have a corresponding formula. From now on we will also give functions a name. This can be convenient if we are dealing with multiple functions. It helps us in easily identifying which function we mean.

#f(3)=# #72#

After all, to calculate #f(3)#, we substitute #x=3# in the function.

We then get: \[f(3)=\left(3-2\right)\cdot \left(3+5\right)\cdot \left(3+6\right)=72\]

Hence, #f(3)=72#.

After all, to calculate #f(3)#, we substitute #x=3# in the function.

We then get: \[f(3)=\left(3-2\right)\cdot \left(3+5\right)\cdot \left(3+6\right)=72\]

Hence, #f(3)=72#.

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