Question

7^(x-1)+7^(x-1)=50
qual o valor de x?

Answer 1

$7^{x-1}+7^{x-1}=50\\\\ \\ 2*7^{x-1}=50\\ \\ 7^{x-1}=25\\ \\ log7^{x-1}=log25\\ \\ (x-1)log7=log25\\ \\ x-1=\frac{log25}{log7}\\ \\ \boxed{x=\frac{log25}{log7}+1}$

Answer 2

depender da pergunta, mais o valor de x e 10