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AP EAMCET202022 Sep 2020Evening ShiftMathematicsTrigonometric Ratios & IdentitiesActual

If (2 x)= 5 -1 4 then x= n 2 +(-1)^n(m) , n Z , find m .

Options

  1. A10
  2. B5
  3. C20
  4. D40

Correct answer

C. 20

Step-by-step solution

aligned 2 x & = 5 -1 4 2 x & = 10 2 x & =n +(-1)^n 10 x & = n 2 +(-1)^n 20 aligned but given, x= n 2 +(-1)^n m On comparison, we get m= 20 Hence, option (3) is correct.

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