Which of the following describes the graph of y = x² - 225?
1) the graph has zeroes at x = 15 and x = 15 and it opens upward.
2) the graph has zeroes at x = -15 and x = -15 and it opens downward.
3) the graph has zeroes at x = 15 and x = -15 and it opens downward.
4) the graph has zeroes at x = 15 an x = -15 and it opens upward.

option 4. The graph has zeroes at x = 15 an x = -15 and it opens upward.

Step-by-step explanation:

we have

This is the equation of a vertical parabola open upward (the leading coefficient is positive)

The vertex represent a minimum

The vertex is the point (0,-225)

The axis of symmetry is x=0 (y-axis)

Find the x-intercepts (values of x when the value of y is equal to zero)

For y=0

square root both sides

therefore

The graph has zeroes at x = 15 an x = -15 and it opens upward.

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step-by-step explanation:

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