Question

Tìm x:\(4^x\)+ \(4^{x+3}\)= 4160

Answer 1

=> 4^x[1 + 4³] = 4160

=> 4^x . 65 = 4160

=> 4^x = 64

=> x = 3

Answer 2

Ta có: 4\(^x\)+4\(^{x+3}\)=4160

\(\Rightarrow\)4\(^x\).(1+4\(^3\))=4160

\(\Rightarrow\)4\(^x\).65=4160

\(\Rightarrow\)4\(^x\)=64

\(\Rightarrow\)4\(^x\)=4\(^3\)\(\Rightarrow\)x=3

Answer 3

4\(^x\)+4\(^x\).64=4160

4\(^x\)(1+64)= 4160

4\(^x\)=4160:65=64

4\(^x\)=4\(^3\)

\(\Rightarrow\)x=3