The expression - x2 + 2x + 3

represents the height of a ball x

seconds after it was thrown. What

are the zeros of the expression and

what do they represent in

context?

Step-by-step explanation:

0 = - x² + 2x + 3

0 = x² - 2x - 3

0 = (x - 3) (x + 1)

x = - 1 or 3

These represent the times that the ball's height is 0. Since negative time doesn't make sense in this context, we would ignore it and say that the ball lands after 3 seconds.