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Question

Match List-I with List-II
List-IList-II
(A) The minimum value of $f(x) = (2x-1)^2+3$(I) 4
(B) The maximum value of $f(x) = -|x + 1| + 4$(II) 10
(C) The minimum value of $f(x) = \sin(2x) + 6$(III) 3
(D) The maximum value of $f(x) = -(x-1)^2+10$(IV) 5

Choose the correct answer from the options given below:

The correct answer is
(A) - (III), (B) - (I), (C) - (IV), (D) - (II)

This question requires us to match functions given in List-I with their corresponding minimum or maximum values from List-II. Let's analyze each function to find its correct match.

Analyzing Function Minimum Value: $f(x) = (2x-1)^2+3$

For the function $f(x) = (2x-1)^2+3$, we need to find its minimum value.

  • The term $(2x-1)^2$ is a square of a real number. The square of any real number is always non-negative, meaning it is greater than or equal to zero.
  • So, the minimum value of $(2x-1)^2$ is $0$.
  • This minimum occurs when $2x-1 = 0$, which implies $x = \frac{1}{2}$.
  • Therefore, the minimum value of the function $f(x)$ is $0 + 3 = 3$.
  • This matches with List-II (III). So, (A) corresponds to (III).

Finding Function Maximum Value: $f(x) = -|x + 1| + 4$

For the function $f(x) = -|x + 1| + 4$, we need to find its maximum value.

  • The term $|x + 1|$ represents the absolute value of $(x+1)$. The absolute value of any real number is always non-negative, meaning it is greater than or equal to zero.
  • So, the minimum value of $|x + 1|$ is $0$. This occurs when $x+1=0$, which means $x=-1$.
  • Consequently, the term $-|x + 1|$ will have a maximum value of $0$ (when $|x+1|=0$).
  • Therefore, the maximum value of the function $f(x)$ is $0 + 4 = 4$.
  • This matches with List-II (I). So, (B) corresponds to (I).

Determining Function Minimum Value: $f(x) = \sin(2x) + 6$

For the function $f(x) = \sin(2x) + 6$, we need to find its minimum value.

  • The sine function, $\sin(\theta)$, has values that range between $-1$ and $1$, inclusive.
  • The minimum value that $\sin(2x)$ can take is $-1$.
  • Therefore, the minimum value of the function $f(x)$ is $-1 + 6 = 5$.
  • This matches with List-II (IV). So, (C) corresponds to (IV).

Calculating Function Maximum Value: $f(x) = -(x-1)^2+10$

For the function $f(x) = -(x-1)^2+10$, we need to find its maximum value.

  • The term $(x-1)^2$ is a square of a real number, so its minimum value is $0$. This occurs when $x-1 = 0$, which means $x=1$.
  • The term $-(x-1)^2$ will therefore have a maximum value of $0$ (when $(x-1)^2=0$).
  • Thus, the maximum value of the function $f(x)$ is $0 + 10 = 10$.
  • This matches with List-II (II). So, (D) corresponds to (II).

Summary of Matches

Based on the analysis, the correct matches are:

  • (A) The minimum value of $f(x) = (2x-1)^2+3$ is 3, matching (III).
  • (B) The maximum value of $f(x) = -|x + 1| + 4$ is 4, matching (I).
  • (C) The minimum value of $f(x) = \sin(2x) + 6$ is 5, matching (IV).
  • (D) The maximum value of $f(x) = -(x-1)^2+10$ is 10, matching (II).

Therefore, the correct option is (A) - (III), (B) - (I), (C) - (IV), (D) - (II).

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Important Questions from Maxima & Minima

  1. Which of the following statements is false about convex minimization problem?

  2. For what value of 'x' will the function y = x2 - 4x have the maximum or minimum value?

  3. For a right-angled triangle, if the sum of the lengths of the hypotenuse and a side is kept constant, in order to have a maximum area of the triangle, the angle between the hypotenuse and the side is

  4. The optimum value of the function f(x) = x2 – 4x + 2 is

  5. As \(\rm x\) varies from \(\rm −1\ to \ +3\), which one of the following describes the behaviour of the function \(\rm f(x) = x^3 – 3x^2 + 1\)?

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