यदि (f(x)=5x+20), तो (f(2x)-f(x)) कब (30) होगा?
If (f(x)=5x+20), when will (f(2x)-f(x)) be (30)?
Explanation opens after your attempt
C. (x=6)
Concept
(f(2x)-f(x)=(10x+20)-(5x+20)=5x). From (5x=30), (x=6).
Why this answer is correct
The correct answer is C. (x=6). (f(2x)-f(x)=(10x+20)-(5x+20)=5x). From (5x=30), (x=6).
Exam Tip
(f(2x)-f(x)=(10x+20)-(5x+20)=5x) है। (5x=30) से (x=6) है।
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