Question

5^х+1 + 5^х = 750
Помогите :(

Answer 1

$5^{x+1}+ 5^{x}=750$
$5^{x}*5 + 5^{x}=750$ 
$5^{x}*(5+1)=750$ 
$5^{x}=750:6$ 
$5^{x}=125$ 
$5^{x}= 5^{3}$ 
x=3
Проверка
$5^{3+1}+ 5^{3}=750$ 
$5^{4}+ 5^{3}=750$ 
625 + 125 = 750
750 = 750 
Ответ: х = 3

Answer 2

спасибо огромное !))