At the start of the basketball game, the referee tosses a ball for a jump ball. The equation that models the height of the ball is
h(t) = -16t2 + 24t + 5
During what time interval is the height of the ball above 9 feet? (Round your answer to the nearest tenth of a second.)

Question

At the start of the basketball game, the referee tosses a ball for a jump ball. The equation that models the height of the ball is 
h(t) = -16t2 + 24t + 5
During what time interval is the height of the ball above 9 feet? (Round your answer to the nearest tenth of a second.)

amistre64 · Answer

subtract 9 from the equation and solve for its zeros

amistre64 · Answer

in other words, you move the graph down by 9 and determine when it is above ....