Question Details

Match List-I with List-II


List-I List-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:

Options

A

(A) - (I), (B) - (II), (C) - (III), (D) - (IV)

B

(A) - (III), (B) - (II), (C) - (I), (D) - (IV)

C

(A) - (III), (B) - (I), (C) - (IV), (D) - (II)

D

(A) - (III), (B) - (IV), (C) - (I), (D) - (II)

Show Answer

Correct Answer :

Option C

(A) - (III), (B) - (I), (C) - (IV), (D) - (II)

Solution :

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

To find the correct match for each function, let us evaluate the minimum or maximum value of each function step-by-step.

Step 1: Evaluate (A)
The given function is:
f ( x ) = ( 2 x - 1 ) 2 + 3
Since the square of any real number is always non-negative, we have:
( 2 x - 1 ) 2 0
Adding 3 to both sides:
( 2 x - 1 ) 2 + 3 3
Thus, the minimum value of f(x) is 3, which occurs when 2x-1=0 (i.e., x=1/2).
Therefore, (A) matches with (III).

Step 2: Evaluate (B)
The given function is:
f ( x ) = - | x + 1 | + 4
Since the absolute value is always non-negative:
| x + 1 <|≥ 0
Multiplying by -1 reverses the inequality:
- | x + 1 <|≤ 0
Adding 4 to both sides:
- | x + 1 <|− + 4 4
Thus, the maximum value of f(x) is 4, which occurs when x=-1.
Therefore, (B) matches with (I).

Step 3: Evaluate (C)
The given function is:
f ( x ) = sin ( 2 x ) + 6
We know that the sine function oscillates between -1 and 1 for any real argument:
- 1 sin ( 2 x ) 1
Adding 6 to all parts of the inequality:
- 1 + 6 sin ( 2 x ) + 6 1 + 6
5 f ( x ) 7
Thus, the minimum value of f(x) is 5.
Therefore, (C) matches with (IV).

Step 4: Evaluate (D)
The given function is:
f ( x ) = - ( x - 1 ) 2 + 10
Since the square term is non-negative:
( x - 1 ) 2 0
Multiplying by -1:
- ( x - 1 ) 2 0
Adding 10 to both sides:
- ( x - 1 ) 2 + 10 10
Thus, the maximum value of f(x) is 10, which occurs when x=1.
Therefore, (D) matches with (II).

Combining all the results:

  • (A) → (III)
  • (B) → (I)
  • (C) → (IV)
  • (D) → (II)
This corresponds to the option: (A) - (III), (B) - (I), (C) - (IV), (D) - (II).

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