Question

Tìm x biết

(X+1)2=25

Answer 1

\(\left(x+1\right)^2=25\)

\(\Rightarrow\left(x+1\right)^2=\left(\pm5\right)^2\)

\(\Rightarrow\left[{}\begin{matrix}x+1=5\\x+1=-5\end{matrix}\right.\)

\(\Rightarrow\left[{}\begin{matrix}x=5-1\\x=-5-1\end{matrix}\right.\)

\(\Rightarrow\left[{}\begin{matrix}x=4\\x=-6\end{matrix}\right.\)

Answer 2

\(\left(x+1\right)\cdot2=25\)

\(2x+2=25\)

\(2x=25-2=23\)

\(x=23:2=11,5\)

Answer 3

\(\left(x+1\right)2=25\)

\(x+1=25:2\)

\(x+1=12,5\)

\(x=12,5-1\\ x=11,5\)

Vậy:\(x=11,5\)

Answer 4

[x+1]2=25

x+1=25:2

x+1=12,5

x=12，5-1

x=11,5

vậy thì x là 11,5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Answer 5

(x+1) 

2

 =25

 

⇒

(

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+

1

)

2

=

(

±

5

)

2

⇒(x+1) 

2

 =(±5) 

2

 

 

⇒

[

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+

1

=

5

�

+

1

=

−

5

⇒[ 

x+1=5

x+1=−5

​

 

 

⇒

[

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=

5

−

1

�

=

−

5

−

1

⇒[ 

x=5−1

x=−5−1

​

 

 

⇒

[

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=

4

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=

−

6

⇒[ 

x=4

x=−6

​