Question

tìm x, biết

2^x+ 2^x+3=288

Answer 1

2^x+2^x+3=288

=>2(2^x)=288-3=285

2^x=142,5(vô lí)

=>ko có x thỏa mãn

Answer 2

\(2^x+2^{x+3}=288\)

\(\Leftrightarrow2^x+2^x.2^3=288\)

\(\Leftrightarrow2^x\left(1+2^3\right)=288\)

\(\Leftrightarrow2^x=32=2^5\)

\(\Leftrightarrow x=5\)