Question

Решить уравнение 3^х+1=27^х-1

Answer 1

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