Question

tìm x, biết : 

2^x + 2^x+3=144

Answer 1

\(2^x+2^{x+3}=144\)

\(\Rightarrow2^x+2^x.2^3=144\)

\(\Rightarrow2^x.\left(1+2^3\right)=144\)

\(\Rightarrow2^x.9=144\)

\(\Rightarrow2^x=\frac{144}{9}=16=2^4\)

\(\Rightarrow x=4\)

k mình đi lê vnhx thuận!

Answer 2

2^x+2^x+3=144

2^x+2^x.2³=144

2^x(1+2³)=144

2^x.9=144

2^x=144/9=16

2^x=4²

Vậyx=2