What happens if the graph has only 1 x-intercept ie. it only crosses the x-asix once ?

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That happens a lot of the time. With a linear equation that is not the same line as the x-axis and is not parallel to it either, it will have only 1 x-intercept. With a parabola, you can have one whose vertex (minimum or maximum point) is on the x-axis, and so it will only cross the x-axis once.