**Exercise
Three: Solution (Calculus)**

**Problem:**

Find the value of x for which A is a maximum. Also determine that maximum
value.

**Solution:**

Take the derivative of A with respect to x.

Set the derivative equal to zero and solve for x.

Find A.

**Answer:**

A has a maximum value of 16 when x is 4.

Solution
(algebraic)

Exercise
Two
Exercise
Four