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If the points where a graph meets the (x)-axis are ((1,0)), ((2,0)), and ((5,0)), how many zeroes are there?

Answer and explanation

Correct answer: (3)

A zero of a polynomial is an x-value at which the graph has y-coordinate 0. On a coordinate plane, every point on the x-axis has the form \((x,0)\). Therefore, each different point where the graph meets the x-axis represents a different zero of the polynomial. The number of zeroes is found by counting these distinct x-axis points, not by counting the y-coordinate, which is 0 for all of them.

The graph meets the x-axis at \((1,0)\), \((2,0)\), and \((5,0)\). Their x-coordinates are 1, 2, and 5, so the zeroes are 1, 2, and 5. Since these are three distinct values, the graph has three zeroes. Thus option A, 3, follows. A repeated point or repeated zero would be counted only once when the question asks for distinct intersections.

Related tags

Number-Of-ZeroesX-InterceptsGraph-ReadingEasy

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