Question

[Hoàng Lan Hương]

Answer 1

[Mai Ngọc]

a) \(2^{n-1}+4.2^n=9.2^5\)

\(2^{n-1}+4.2.2^{n-1}=9.2^5\Rightarrow2^{n-1}\left(1+4.2\right)=9.2^5\)

\(\Rightarrow2^{n-1}.9=9.2^5\Rightarrow2^{n-1}=2^5\Rightarrow n-1=5\Rightarrow n=6\)