### 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(1)=# #-50#

After all, to calculate #f(1)#, we substitute #x=1# in the function.

We then get: \[f(1)=\left(1-6\right)\cdot \left(1+9\right)=-50\]

Hence, #f(1)=-50#.

After all, to calculate #f(1)#, we substitute #x=1# in the function.

We then get: \[f(1)=\left(1-6\right)\cdot \left(1+9\right)=-50\]

Hence, #f(1)=-50#.

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