Question

найдите корень уравнения (125) ^ x-9 = 5

Answer 1

(1/25) ^ (x - 9) = 5
5^ ( - 2(x - 9) )  = 5^1
- 2 ( x - 9) = 1
- 2x + 18 = 1 
- 2x = - 17
x = 8,5