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NDA 2013
Exam
NDA
Year
2013
Subject
Mathematics
Chapter
Quadratic Equation

NDA 2013 · Mathematics · Quadratic Equation

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

If 4x−6.2x+8=04^x-6.2^x+8=0, then the values of xx are

Options

  1. A1,21,2
  2. B1,11,1
  3. C1,01,0
  4. D2,22,2

Correct answer

A. 1,21,2

Step-by-step solution

 Put 2x=t;t2−6t+8=0t=2,4;x=1,2\begin{array}{ll}\text{ Put } 2^x=t & ; \quad t^2-6 t+8=0 \\ t=2,4 & ; \quad x=1,2\end{array}
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