Question

làm câu b thui nhé!

Answer 1

\(2^{3x+2}=4^{x+5}\)

\(\Rightarrow2^{3x+2}=2^{2x+10}\)

\(\Rightarrow3x+2=2x+10\Rightarrow x=8\)

Answer 2

a, \(\left|x+\dfrac{3}{4}\right|=\dfrac{5}{7}\\ \Rightarrow\left[{}\begin{matrix}x+\dfrac{3}{4}=-\dfrac{5}{7}\\x+\dfrac{3}{4}=\dfrac{5}{7}\end{matrix}\right.\\ \Rightarrow\left[{}\begin{matrix}x=-\dfrac{41}{28}\\x=-\dfrac{1}{28}\end{matrix}\right.\)

b, \(2^{3x+2}=4^{x+5}\\ \Rightarrow2^{3x+2}=2^{2x+10}\\ \Rightarrow3x+2=2x+10\\ \Rightarrow x=8\)

Answer 3

=>2^3x+2=(2²)^x+5

=>2^3x+2=2^2x+10

=>3x+2=2x+10

=>3x-2x=10-2

=>x=8