Question

Tìm x 

2^x + 2^x+3 = 144

Answer 1

\(2^x+2^{x+3}=144\) 

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

\(2^x\left(1+8\right)=144\)

\(2^x.9=144\)

\(2^x=16\)

\(2^x=2^4\)

\(\Rightarrow x=4\)

Answer 2

2^x+2^x+3=144

=>2^x.1+2^x.2^3=144

=>2^x.(1+2^3)=144

=>2^x.(1+8)=144

=>2^x=144:9

2^x=16

=>2^x=2^4

vậy x=4