Identify following graph as a linear, quadratic and cubic polynomials? Justify your answer.
(i)

(ii)

(iii)

(3 Marks)

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Solution

This graph is cutting x-axis at three different point so it has three zeroes of the polynomials. Hence, it is a cubic polynomial.
[1 mark]

(ii)
This graph is an parabola, cutting x-axis at two different point so it has two zeroes of the polynomials. Hence, it is a quadratic polynomial.
[1 mark]

(iii)
This graph is a straight line and cutting x-axis at only one point so it has only one zero of the polynomials. Hence, it is a linear polynomial.
[1 mark]

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