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)?
Explanation opens after your attempt
C. (x=6)
Concept
(f(2x)-f(x)=(14x+18)-(7x+18)=7x). From (7x=42), (x=6).
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).
Exam Tip
(f(2x)-f(x)=(14x+18)-(7x+18)=7x) है। (7x=42) से (x=6) है।
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