2. A rocket is fired down a practice range. The height of the rocket in metres ofter t seconds is given by h
Find the maximum height attained by the rocket. the answer is (54 m )

3. Find two numbers whose difference is 10 and whose product is a minimum. the answer is (5,-5)

4. Find two numbers whose sum is 120 and whose product is a maximum. the answer is( 60, 60)
calculate by optimization problems or factoring or complete square ​