Question Details

For the function f(x) = 2x3 − 9x2 + 12x − 5, x ∈ [0,3], match List-I with List-II:


Options

A

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

B

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

C

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

D

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

Show Answer

Correct Answer :

Option A

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

Solution :

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

By analyzing the provided image, we see a table that lists several properties of a function under List-I, and corresponding values or points under List-II:
List-I:
(A) Absolute maximum value
(B) Absolute minimum value
(C) Point of maxima
(D) Point of minima

List-II:
(I) 3
(II) 0
(III) -5
(IV) 4

To determine the correct match, we analyze the function:

f(x)=2x3-9x2+12x-5

over the closed interval:

x[0,3]

Step 1: Find the critical points of the function
We first compute the first derivative of the function with respect to x:

f'(x)=ddx(2x3-9x2+12x-5)

f'(x)=6x2-18x+12

Next, we set the derivative equal to zero to find the critical points:

6x2-18x+12=0

Divide the entire equation by 6:

x2-3x+2=0

Factor the quadratic equation:

(x-1)(x-2)=0

This gives the critical points:

x=1

and

x=2

Both of these critical points lie within the specified closed interval [0,3].

Step 2: Evaluate the function at the critical points and the boundaries
We evaluate the value of f(x) at the boundaries x=0 and x=3, as well as at the critical points x=1 and x=2:

1. At the boundary x=0:
f(0)=2(0)3-9(0)2+12(0)-5=-5

2. At the critical point x=1:
f(1)=2(1)3-9(1)2+12(1)-5=2-9+12-5=0

3. At the critical point x=2:
f(2)=2(2)3-9(2)2+12(2)-5=16-36+24-5=-1

4. At the boundary x=3:
f(3)=2(3)3-9(3)2+12(3)-5=54-81+36-5=4

Step 3: Determine the matches for List-I and List-II

(A) Absolute maximum value:
Comparing the function values -5,0,-1,4, the largest value is 4.
Thus, the absolute maximum value is 4, which corresponds to (IV).

(B) Absolute minimum value:
Comparing the function values, the smallest value is -5.
Thus, the absolute minimum value is -5, which corresponds to (III).

(C) Point of maxima (Absolute Maxima):
The absolute maximum value of 4 is achieved at x=3.
Thus, the point of maxima is 3, which corresponds to (I).

(D) Point of minima (Absolute Minima):
The absolute minimum value of -5 is achieved at x=0.
Thus, the point of minima is 0, which corresponds to (II).

Combining all of the matches, we get:
(A) - (IV), (B) - (III), (C) - (I), (D) - (II)

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