Question

Tìm x biết \(\frac{x+1}{2}=\frac{8}{x+1}\)

 

Answer 1

\(\frac{x+1}{2}=\frac{8}{x+1}\)

=> (x + 1)(x + 1) = 8.2

=> (x + 1)² = 16

=> x + 1 = 4 hoặc x + 1 = - 4

=> x = 3 hoặc x = - 5

Answer 2

 

\(\frac{x+1}{2}=\frac{8}{x+1}\)

\(\Rightarrow\left(x+1\right)^2=8.2\)

\(\Rightarrow\left(x+1\right)^2=16\)

\(\Rightarrow\left(x+1\right)^2=4^2\)

\(\Rightarrow x+1=4\)

\(\Rightarrow x=3\)

 

 

Answer 3

=>(x+1).(x+1)=8.2

    (x+1)\(^2\)=16

     (x+1)\(^2\)=4\(^2\)

=>x+1=4

     x=4-1

     x=3

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