$($a$)$ Enter the function $(,)=+$

$$ as an inline or anonymous function. Evaluate the

function at $=2$ and $=1.$

$($b$)$ Type clear f to clear the value of the function from part $($a$).$ Now write a function M$-$file

for the function $(,)=+$

$.$ Save the file as f$.$m $($include the M$-$file in your report$).$

Evaluate the function at $=2$ and $=1$ by entering f$(2,-1)$ in the command window.