explain why

Question

Explain why parentheses are used in the statement of the solution of Example 10: (x² - 64π) ft².

Answer 1

The parenthesis helps to separate the measured valued from the unit.  In this case, the measured value is represented by the expression    x² - 64π.  The unit is ft².  The unit tells us that the measured value is the area of a figure, and that each side of the figure is measured in feet.