Question

7^2x-2*7^x-35=0
Решите пожалуйста

Answer 1

7²ˣ - 2*7ˣ - 35 = 0
(7ˣ)² - 2*7ˣ - 35 = 0
t² - 2t - 35 = 0
t = 7; t = -5.
7ˣ = 7
7ˣ = -5

x = 1
x ∈ ∅