Question

Решите пожалуйста № 1 и №4

Answer 1

Решение
1)  bn+1 = 4bn + 7
b₁ = 3
n = 1
 b₂ = 4*3 + 7 = 19
n = 2
b₃ = 4*19 + 7 = 83
n = 3
b₄ = 4*83 + 7 = 339

2)  b₂ * b₈ = 36
b₁q * b₁q⁷ = 36
(b₁² * q⁸) = 36
((b₁ * q⁴)² = 36
b₅² = 36
b₅ = - 6 или b₅ = 6