Question

Mă ajutati vă rog? Rezolvati in multimea nr reale ecuatia (1/3) la puterea 2x+10=81

Answer 1

$\frac{1}{3}^{2}x+10=81\\\frac{1}{3^{2}}x=81-10\\\frac{1}{9}x=71\\ x=\frac{71*9}{1}\\x=\frac{639}{1}\\x=639$