Expert Mathematics Relations and Functions Class 12 Level 20

यदि (f(x)=x+2) और (g(x)=3x-1), तो (\(f\circ g\)(x)- \(g\circ f\)(x)) का मान क्या है?

If (f(x)=x+2) and (g(x)=3x-1), what is the value of (\(f\circ g\)(x)-\(g\circ f\)(x))?

Explanation opens after your attempt
Correct Answer

C. (-4)

Step 1

Concept

(f(g(x))=f(3x-1)=3x+1).

Step 2

Why this answer is correct

(g(f(x))=g(x+2)=3x+5).

Step 3

Exam Tip

The difference is (3x+1-(3x+5)=-4), so order matters in composition. चरण 1: (f(g(x))=f(3x-1)=3x+1)। चरण 2: (g(f(x))=g(x+2)=3x+5)। चरण 3: अंतर (3x+1-(3x+5)=-4) है, इसलिए क्रम बदलने से मान बदल सकता है।

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Mathematics Answer, Explanation and Revision Hints

यदि (f(x)=x+2) और (g(x)=3x-1), तो (\(f\circ g\)(x)- \(g\circ f\)(x)) का मान क्या है? / If (f(x)=x+2) and (g(x)=3x-1), what is the value of (\(f\circ g\)(x)-\(g\circ f\)(x))?

Correct Answer: C. (-4). Explanation: चरण 1: (f(g(x))=f(3x-1)=3x+1)। चरण 2: (g(f(x))=g(x+2)=3x+5)। चरण 3: अंतर (3x+1-(3x+5)=-4) है, इसलिए क्रम बदलने से मान बदल सकता है। / Step 1: (f(g(x))=f(3x-1)=3x+1). Step 2: (g(f(x))=g(x+2)=3x+5). Step 3: The difference is (3x+1-(3x+5)=-4), so order matters in composition.

Which concept should I revise for this Mathematics MCQ?

(f(g(x))=f(3x-1)=3x+1).

What exam hint can help solve this Mathematics question?

The difference is (3x+1-(3x+5)=-4), so order matters in composition. चरण 1: (f(g(x))=f(3x-1)=3x+1)। चरण 2: (g(f(x))=g(x+2)=3x+5)। चरण 3: अंतर (3x+1-(3x+5)=-4) है, इसलिए क्रम बदलने से मान बदल सकता है।

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