Holly plays tennis on the school tennis team. She can hit a tennis ball really high in the air. She learned that the
quadratic equation below could be used to determine the
height of a tennis ball after it was hit with a tennis racket.
y = -6x2 + 36%
She defined the variables for us:
y = the height of the tennis ball in feet
x = seconds after the ball is hit with the
How long does it take for the ball to hit the ground in
seconds?
Hint: When the ball hits the ground, the height of the tennis
ball, y, is 0.