Solve the expressions.

a.

The expression is .

                     (To find maximum condition equal to zero)

              (Factors)

      (Take out common factor)

                (Simplify)

and       (Separate solutions)

and                     (Simplify)

b.

The expression is .

                   (To find maximum condition equal to zero)

       (Subtract from each side)

                     (Apply additive inverse property: )

                (Divide each side by )

                             (Cancel common terms)

and                  (Separate solutions)

and                       (Simplify)

c.

The expression is .

              (To find maximum condition equal to zero)

                   (Simplify)

and          (Separate solutions)

and                  (Simplify)

The answer is C.Because of simply solve to find the time.