Question

Решить уравнение 3^х+1=27^х-1

Answer 1

$3 {}^{x + 1} = 27 {}^{x - 1} \\ \\ {3}^{x + 1} = 3 {}^{3x - 3} \\ \\ x + 1 = 3x - 3 \\ \\ x - 3x = - 3 - 1 \\ \\ - 2x = - 4 \\ \\ x = 2$