Question

2^n+2^n+2=20

Answer 1

\(2^n+2^{n+2}=20\)

\(2^n+2^n\times2^2=20\)

\(2^n\times\left(1+2^2\right)=20\)

\(2^n\times5=20\)

\(2^n=20\div5\)

\(2^n=4\)

\(2^n=2^2\)

\(\Rightarrow n=2\)

Chắc đúng nhỉ ?

Answer 2

=> 2ⁿ . 2 = 20 - 2

=>2ⁿ⁺¹ = 18 = 2^?

I don't know