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NDA2013MathematicsQuadratic EquationActual

If 4^x-6.2^x+8=0 , then the values of x are

Options

  1. A1,2
  2. B1,1
  3. C1,0
  4. D2,2

Correct answer

A. 1,2

Step-by-step solution

array ll Put 2^x=t & ; t^2-6 t+8=0 t=2,4 & ; x=1,2 array

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