The values of \(x\) at the stationary points of \(f(x)=x^3+3 x^2-2\) are

The values of \(x\) at the stationary points of \(f(x)=x^3+3 x^2-2\) are
  1. 0,2
  2. 1,2
  3. \(0,-2\)
  4. 1,1

Solution

Let \(y=f(x)=x^3+3 x^2-2\) \(\frac{d y}{d x}=3 x^2+6 x \Rightarrow \frac{d^2 y}{d x^2}=6 x+6\) For stationary points \(\frac{d y}{d x}=0\) \(\Rightarrow \quad 3 x(x+2)=0 \Rightarrow x=0,-2\)

Asked in: AP EAMCET 2020 (17 Sep Shift 1)

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