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JEE Mains · Maths · STD 11- 2. Relation and Function

अंतराल \([-1,2]\) में फलन \(\mathrm{f}(\mathrm{x})=\left|\mathrm{x}^2-\mathrm{x}+1\right|+\left[\mathrm{x}^2-\mathrm{x}+1\right],\) जहाँ [\(t\)]महत्तम पूर्णाक फलन है, का निरपेक्ष न्यूनतम मान है :

  1. A \(\frac{3}{4}\)
  2. B \(\frac{3}{2}\)
  3. C \(\frac{1}{4}\)
  4. D \(\frac{5}{4}\)
Verified Solution

Answer & Solution

Correct Answer

(A) \(\frac{3}{4}\)

Step-by-step Solution

Detailed explanation

\(f ( x )=\left| x ^2- x +1\right|+\left[ x ^2- x +1\right] ; x \in[-1,2]\) Let \(g(x)=x^2-x+1\) \(=\left(x-\frac{1}{2}\right)^2+\frac{3}{4}\) \(\because\left| x ^2- x +1\right| \text { and }\left[ x ^2- x +2\right]\) Both have minimum value at \(x =1 / 2\)…
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