Question

(2x-3)^2=49

Tìm x

Answer 1

(2x-3)²=49

(2x-3)²=7² hoặc (2x-3)² = (-7)²

2x - 3 = 7 hoặc 2x - 3 = -7

Vậy x = 5 hoặc x = -2

Answer 2

(2x-3)^2=49

2x-3=7

2x   =10

x     =5

Answer 3

\(\left(2x-3\right)^2=49\)

\(\Leftrightarrow\hept{\begin{cases}\left(2x-3\right)^2=7^2\\\left(2x-3\right)^2=\left(-7\right)^2\end{cases}}\)

\(\hept{\begin{cases}2x-3=7\\2x-3=-7\end{cases}}\)

\(\hept{\begin{cases}2x=10\\2x=-4\end{cases}}\)

\(\hept{\begin{cases}x=5\\x=-2\end{cases}}\)

Answer 4

\(\left(2x-3\right)^2=49\)

\(=>\sqrt{\left(2x-3\right)^2}=\sqrt{49}\)

\(=>2x-3=7\)

\(=>2x=10\)

\(=>x=5\)

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