Question

( 2x – 1 )2 – 25 = 0

Answer 1

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

 \(\Leftrightarrow\left[{}\begin{matrix}2x-1=5\\2x-1=-5\end{matrix}\right.\) \(\Leftrightarrow\left[{}\begin{matrix}x=3\\x=-2\end{matrix}\right.\)

  Vậy ...

Answer 2

(2x - 1) . 2 - 25 = 0

= 4x - 2 - 25 = 0

= 4x - 27 = 0

= 4x = 27

= x = \(\dfrac{27}{4}\)

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Answer 3

(2x-1)2-25=0

(2x-1)2=0+25

(2x-1)2=25

2x-1=25/2

2x-1=12.5

2x=12.5+1

2x=13.5

x=13.5/2

x=27/4

Vậy x bằng 27/4