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Q.

Which of the following is/ are not a graph of a quadratic polynomial?

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a

Question Image

b

Question Image 

c

Question Image

d

Question Image

answer is B.

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Detailed Solution

Given, some graphs.
We need to find which is not a graph of the quadratic equation.
(1)
Question ImageSince the graph intersects the x-axis at two distinct points A and B.
 Question ImageIt is a graph of a quadratic.
(2)
 Question ImageSince, the graph turning in the fourth quadrant, it meets the x-axis at two different positions, A and B.
Question ImageIt is not a graph of a quadratic.
(3)
Question Image The graph intersects the x-axis at points A and B.
Question ImageIt is a graph of a quadratic.
(4)
Question ImageSince the graph only has one point where it touches the x-axis.
∴It can be a graph of the quadratic equation having two equal real roots.
Only graph (2) equation is not quadratic.
Hence, the correct option is 2.
 
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