Graph of Quadratic Polynomial

Case 1: When the graph cuts the x-axis at the two points than these two points are the two zeroes of that quadratic polynomial.

Case 2: When the graph cuts the x-axis at only one point then that particular point is the zero of that quadratic polynomial and the equation is in the form of a perfect square

Case 3: When the graph does  not intersect the x-axis at any point i.e. the graph is either completely above the x-axis or below the x-axis then that quadratic polynomial has no zero as it is not intersecting the x-axis at any point.

Hence the quadratic polynomial can have either two zeroes, one zero or no zero. Or you can say that it can have maximum two zero only.

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