Let $\"\"$ be a point on the $\"\"$ .

(a) Express the distance $\"\"$ from $\"\"$ to the point $\"\"$ as a function of $\"\"$ .

$\"\"$

Substitute $\"\"$ in $\"\"$ .

$\"\"$

$\"\"$ .

(b) Graph the function $\"\"$ .

Graph of $\"\"$ :

$\"\"$

(c) For what values of $\"\"$ is $\"\"$ smallest ?

Plot the local minimum point on the graph of $\"\"$ .

$\"\"$

Observe the graph:

The local minimu point at $\"\"$ .

$\"\"$ is smallest when $\"\"$ .

(a) $\"\"$ .

(b) Graph of $\"\"$ :

$\"\"$

(c) $\"\"$ is smallest when $\"\"$ .