Question

9 la puterea x+1 - 4x3 la puterea 2x=45

Answer 1

$\rm 9^{x+1}-4 \cdot 3^{2x}=45 \\ \\ 9^{x+1}-4 \cdot 9^x=45 \\ \\ 9^x(9-4)=45 \\ \\ 9^x \cdot 5 =45 \Rightarrow 9^x=9 \Rightarrow x=1. \\ \\ \underline{Solutie}:~x=1.$