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4 May, 14:10

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?

+5
Answers (1)
  1. 4 May, 16:04
    0
    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.
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