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Question: Answered & Verified by Expert
A function $y=f(x)$ with $f(-1)=-249$ has no maximum and has only one minimum at $x=5$ with $f(5)=75$. Which one of the following is true?
MathematicsContinuity and DifferentiabilityTS EAMCETTS EAMCET 2020 (11 Sep Shift 1)
Options:
  • A At some point in $(-1,5), f(x)$ is discontinuous
  • B The minimum value cannot be 75 since $f(-1) < f(5)=75$
  • C $f(x)$ is discontinuous at every point of $\mathbf{R}$
  • D $f(x)$ is continuous on $\mathbf{R}$
Solution:
1434 Upvotes Verified Answer
The correct answer is: At some point in $(-1,5), f(x)$ is discontinuous
It is given that there is a function $y=f(x)$ such that it have no maximum but has only one minimum at $x=5$ with $f(5)=75$, but $f(-1)=-249$ is given, so it is only possible the function is not continuous in $(-1,5)$.

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