यदि (f(x)=7x+18), तो (f(2x)-f(x)) कब (42) होगा?

If (f(x)=7x+18), when will (f(2x)-f(x)) be (42)?

Author: Muft Shiksha Editorial Team Published:
Explanation opens after your attempt
Correct Answer

C. (x=6)

Step 1

Concept

(f(2x)-f(x)=(14x+18)-(7x+18)=7x). From (7x=42), (x=6).

Step 2

Why this answer is correct

The correct answer is C. (x=6). (f(2x)-f(x)=(14x+18)-(7x+18)=7x). From (7x=42), (x=6).

Step 3

Exam Tip

(f(2x)-f(x)=(14x+18)-(7x+18)=7x) है। (7x=42) से (x=6) है।

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Mathematics Answer, Explanation and Revision Hints

यदि (f(x)=7x+18), तो (f(2x)-f(x)) कब (42) होगा? / If (f(x)=7x+18), when will (f(2x)-f(x)) be (42)?

Correct Answer: C. (x=6). Explanation: (f(2x)-f(x)=(14x+18)-(7x+18)=7x) है। (7x=42) से (x=6) है। / (f(2x)-f(x)=(14x+18)-(7x+18)=7x). From (7x=42), (x=6).

Which concept should I revise for this Mathematics MCQ?

(f(2x)-f(x)=(14x+18)-(7x+18)=7x). From (7x=42), (x=6).

What exam hint can help solve this Mathematics question?

(f(2x)-f(x)=(14x+18)-(7x+18)=7x) है। (7x=42) से (x=6) है।