Question

36 la putere x +7ori 2la puterea x ori 3la puterea x - 78=0

Answer 1

$36^{x}+7* 2^{x}* 3^{x}-78=0 \\ 36^{x}-7* 6^{x}-78=0 \\ fie 6^{x}=t,t\ \textgreater \ 0 \\ t^{2}+7t-78=0 \\ t=-13 \\ t=6 \\ revenim la substitutie \\ 6^{x} =6 \\ x=1$