$$\text{f}(x)+11$$ - 

The output of $$\text{f}(x)$$ has $$11$$ added to it.

$$\text{f}(x+11)$$ - 

The input has $$11$$ added to it before the function is applied.

$$11\text{f}(x)$$ - 

The output of $$\text{f}(x)$$ is multiplied by $$11$$

$$\text{f}(x)-11$$ - 

The output of $$\text{f}(x)$$ has $$11$$ subtracted from it.

$$\text{f}(x-11)$$ - 

The input has $$11$$ subtracted before the function is applied.

$$\text{f}(8)+3$$ - 

$$40$$

$$3\text{f}(8)$$ - 

$$111$$

$$\text{f}(8)-3$$ - 

$$34$$

$$-3\text{f}(8)$$ - 

$$-111$$

$$3\text{f}(8)-3$$ - 

$$108$$