Question

(3x-1)mũ 2 =64

 tìm x

Answer 1

Ta có:64=8\(^2\)

\(\Rightarrow\)3x-1=8

3x=8+1

3x=9

x=9:3

x=3

Vậy x=3.

Answer 2

\(\left(3x-1\right)^2=64\)

\(\Rightarrow\left(3x-1\right)^2=8^2\)

\(\Rightarrow3x-1=8\)

\(\Rightarrow3x=9\)

\(\Rightarrow x=3\)

Vậy x = 3

 

 

Answer 3

Ta có:

\(\left(3x-1\right)^2=64\)

\(\Rightarrow\)\(\left(3x-1\right)^2=8^2\)

\(\Rightarrow\)\(3x-1=8\)

\(3x=8+1\)

\(3x=9\)

\(x=9:3\)

\(x=3\)

Vậy x = 3

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