The function $f(x) = x^{2} + 2x - 5$ is strictly increasing in the interval

  • A
    $(-1, \infty)$
  • B
    $(-\infty, -1)$
  • C
    $[-1, \infty)$
  • D
    $(-\infty, 1)$

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Prove that the function $f$ given by $f(x)=x^{2}-x+1$ is neither strictly increasing nor decreasing on $(-1,1).$

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