Question

3 · 4^2x+1 − 156 = 72 : 2

 

Answer 1

\(\Leftrightarrow3\cdot4^{2x+1}=36+156=192\)

=>2x+1=3

hay x=1

Answer 2

\(3.4^{2x+1}-156=72:2\)

\(3.4^{2x+1}-156=36\)

\(4^{2x+1}-156=36:3\)

\(4^{2x+1}-156=12\)

\(4^{2x+1}=12+156\)

\(4^{2x+1}=168\)

\(2x+1=168:4\)

\(2x+1=42\)

\(x+1=42:2\)

\(x+1=21\)

\(x=21-1\)

\(x=20\)