Question

\(8^x\): \(4^x\)=16

Answer 1

\(8^x:4^x=16\)

\(\Leftrightarrow2^{3x}:2^{2x}=2^4\)

\(\Leftrightarrow2^{3x-2x}=2^4\)

\(\Leftrightarrow3x-2x=4\)

\(\Leftrightarrow x=4\)

Vậy ..

Answer 2

\(8^x:4^x=16\)

\(\left(8:4\right)^x=16\)

\(2^x=16\)

=> x = 4

Answer 3

\(\dfrac{8^x}{4^x}=16\Rightarrow\left(\dfrac{8}{4}\right)^x=2^4\Rightarrow2^x=2^4\Rightarrow x=4\)