Question

Determinati numarul n. Punctele b) d)

Answer 1

b) 2^n ( 2³ + 2 - 1) = 9 × (2²)^13
2^n × (10 - 1) = 9 × 2^26
9 × 2^n = 9× 2^26
2^n = 2^26
n = 26

d) 7^(2n -n) + 7^(n+ 2 -1) = 8 × 7^11
7^n + 7^(n + 1) = 8× 7^11
7^n (1 + 7) = 8 × 7^11
8 × 7^n = 8 × 7^11
7^n = 7^11
n =11