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JEE Mains Model Paper 4
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© examsnet.com
Question : 20
Total: 90
The function f(x) =
4
−
x
2
4
x
−
x
3
is
discontinuous at only point
discontinuous at exactly two points
discontinuous at exactly three points
none of these
Validate
Solution:
We have f(x) =
4
−
x
2
4
x
−
x
3
Which is discontinuous where 4x -
x
3
= 0
Or x(4 -
x
2
) = 0 or x = 0 , x = ±2
So, /(x) is discontinuous at exactly three points
© examsnet.com
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