Question:medium

If \( f(x) = a^2 - 1 \), \( x^3 - 3x + 5 \) is a decreasing function of \( x \in R \), then the set of possible values of \( a \) (independent of \( x \)) is:

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For a decreasing function, use the derivative test to find the possible values of parameters.
Updated On: Mar 25, 2026
  • \( [1, \infty) \)
  • \( (-1, \infty) \)
  • \( [-1, 1] \)
  • \( (-\infty, 1] \)
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The Correct Option is C

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