Question

(2.x-1)^2=25

Answer 1

\((2x-1)^2=25\)

\((2x-1)^2=5^2\) hoặc \((2x-1)^2=(-5)^2\)

\(2x-1=5\)    hoặc \(2x-1=-5\)

\(@TH1:2x-1=5=>2x=6=>x=3\)

\(@TH2:2x-1=-5=>2x=-4=>x=-2\)

Answer 2

( 2x - 1 ) ² = 25

( 2x - 1 ) ² = 5²

2x - 1 = 5

2x = 6

x = 3

Answer 3

`(2x-1)^2=25`

`(2x-1)^2 =` \(\pm5\)

`@TH1:`

`2x-1=5`

`2x=5+1`

`2x=6`

`x=6:2`

`x=3`

@TH2:`

`2x+1=-5`

`2x=-5+1`

`2x=-4`

`x=-4:2`

`x=-2`

Vậy `S = {3;-2}`