Question

Sa se rezolve in multimea numereler reale ecuatia : 16^x+3x4^x=4

Answer 1

notez $4^{x} =a \\ a^{2} +3a-4=0 \\ (a+4)(a-1)=0 \\ a+4=0 \\ a=-4 \\ 4^{x}=-4 \ imposibil \\ a=1 \\ 4^{x}=1= 4^{0} \\ x=0$