Question

bài 1 : 2^n+2 - 2^n = 96

Answer 1

\(2^{n+2}-2^n=96\\ \Rightarrow4.2^n-2^n=96\\ \Rightarrow3.2^n=96\\ \Rightarrow2^n=32\\ \Rightarrow2^n=2^5\\ \Rightarrow n=5\)

Answer 2

\(\Rightarrow2^n\left(2^2-1\right)=96\\ \Rightarrow2^n=\dfrac{96}{3}=32=2^5\\ \Rightarrow n=5\)