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If  then 2f(x) – f(2x) =

  1. 2a
  2. a + 4x
  3. a – 4x
  4. a

Answer (Detailed Solution Below)

Option 4 : a
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Detailed Solution

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Concept:

If  then determinant of A is given by:

|A| = (a­11 × a22) - (a12 × a21)

Calculation:

Given: 

To find: 2f(x) – f(2x) =?

So,                  (put x = 2x)

Hence, option (4) is correct.

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