Question

4 (elevado a x) + 2 (elevado a 2x +3) = 9.

Answer 1

 
 
 
 4 (elevado a x) + 2 (elevado a 2x +3) = 9.
  
   4^x + 2^(2x+3) = 9
   2^2x + 2^3.2^x = 9
   2^2x + 8.2^x = 9
   9.2^x = 9
      2^x = 9/9
      2^x = 1
      2^x = 2^0
   
         x = 0