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8-18.
  1. Graph y = x2 − 9 on graph paper. Homework Help ✎

    1. Name the y-intercept. What is the connection between the y-intercept and the rule y = x2 − 9?

    2. Name the x-intercepts. What is the connection between the x-intercepts and the rule y = x2 − 9?

The y-intercept is where the parabola intersects the
y-axis.

The y-intercept is where x = 0.
y = (0)² − 9
y = −9

The x-intercept is where the parabola intersects the
x-axis.

The x-intercept is where y = 0
0 = x² − 9
9 = x²

x = −3, +3