How to solve
A zero of f is an x-value where f(x) = 0. On the graph, zeros are exactly the points where the curve crosses the x-axis.
Steps
- Find the graph’s intersections with the x-axis.
- Read the x-coordinate of the requested intersection.
- Check that the corresponding y-coordinate is 0.
Example
A parabola crosses at (−2, 0) and (3, 0).
- The zeros are −2 and 3.
- The positive zero is 3.
Answer: 3
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