Question

tìm x biết ( 2x+1 )² = 625

Answer 1

\(\left(2x+1\right)^2=625\)

<=>  \(\orbr{\begin{cases}2x+1=25\\2x+1=-25\end{cases}}\)

<=>  \(\orbr{\begin{cases}x=12\\x=-13\end{cases}}\)

Vậy...

Answer 2

\(\left(2x+1\right)^2=625\)

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

\(\Rightarrow2x+1=25\)

\(\Leftrightarrow x=12\)

P/s tham khảo nha

Answer 3

\(\left(2x+1\right)^2=625\)

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

\(\Rightarrow\orbr{\begin{cases}2x+1=25\\2x+1=-25\end{cases}\Leftrightarrow\orbr{\begin{cases}2x=24\\2x=-26\end{cases}\Leftrightarrow}\orbr{\begin{cases}x=12\\x=-13\end{cases}}}\)

Vậy \(\orbr{\begin{cases}x=12\\x=-13\end{cases}}\)

Answer 4

\(\left(2x+1\right)^2=625\)

\(\Leftrightarrow2x+1=\pm\sqrt{625}\)

\(\Leftrightarrow2x+1=\pm25\)

\(\Leftrightarrow\orbr{\begin{cases}2x+1=25\\2x+1=-25\end{cases}}\)

\(\Leftrightarrow\orbr{\begin{cases}x=12\\x=-13\end{cases}}\)

Vậy x = 12 hoặc x = 13

Answer 5

\(\left(2x+1\right)^2=625\)

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

\(\orbr{\begin{cases}2x+1=25\Rightarrow x=12\\2x+1=-25\Rightarrow x=-13\end{cases}}\)

hok tốt .

Answer 6

(2x+1)²=625

<=> 2x+1=25

<=>2x=25-1

<=>2x=24

<=>x=24:2

<=>x=12

vậy x=12

Answer 7

TH2

<=>2x+1=-25

<=>2x=-25-1

<=>2x=-26

<=>x=-26:2

<=>x=-13

vậy x=-13

Answer 8

\(\left(2x+1\right)^2=625\)

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

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

\(\Rightarrow2x=24\)

\(\Rightarrow x=12\)