Question

Tìm x , biết:

\(4^x+4^{x+3}=4160\)

Answer 1

4^x+4^x+3=4160

\(\Rightarrow\)4^x+4^x.4³=4160

\(\Rightarrow\)4^x.(1+4³)=4160

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

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

\(\Rightarrow\)4^x=64

\(\Rightarrow\)4^x=4³

\(\Rightarrow\)x=3

Answer 2

\(4^x+4^{x+3}=4160\)

\(4^x\left(1+4^3\right)=4160\)

\(\Rightarrow4^x\cdot65=4160\)

\(\Rightarrow4^x=64\)

\(\Rightarrow4^x=4^3\)

\(\Rightarrow x=3\)

Answer 3

Ta làm theo kiểu đặt nhân tử chung nha :

  \(4^x+4^{x+3}=4160\)

\(=>4^x\left(1+4^3\right)=4160\)

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

\(=>4^x=64\)

\(=>x=3\)

Answer 4

=> x = 3

Answer 5

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