Aspire Faculty ID #13873 · Topic: JAMIA MILLIA ISLAMIA MCA 2021 · Just now
JAMIA MILLIA ISLAMIA MCA 2021

. Find the number of points where $f(x) = |2x + 1| - 3|x + 2| + |x^2 + x - 2|$ is non-differentiable.

Solution

**Solution:** Non-differentiable points occur where expressions inside modulus = 0. 1. $2x + 1 = 0 \Rightarrow x = -\dfrac{1}{2}$ 2. $x + 2 = 0 \Rightarrow x = -2$ 3. $x^2 + x - 2 = 0 \Rightarrow x = 1, -2$ Unique points: $x = -2, -\dfrac{1}{2}, 1$ Hence, number of non-differentiable points = 3. $\boxed{\text{Answer: (B) 3}}$

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