Question

2 . x + 5 = 3 mũ 4 : 3 mũ 2 + 3 mũ 2 . 2 mũ 2

 

Answer 1

\(2x+5=3^4:3^2+3^2\cdot2^2\)

=>\(2x+5=3^2+9\cdot4\)

=>2x+5=9+36=45

=>2x=40

=>\(x=\dfrac{40}{2}=20\)

Answer 2

\(2x+5=3^4:3^2+3^2\cdot2^2\)

\(\Leftrightarrow2x+5=3^{4-2}+\left(3\cdot2\right)^2\)

\(\Leftrightarrow2x+5=3^2+6^2\)

\(\Leftrightarrow2x+5=9+36=45\)

\(\Leftrightarrow2x=40\)

\(\Leftrightarrow x=20\)