Question

(3.x+1)^2=25.4. tìm x

Answer 1

`(3x+1)^2=25.4`

<=> `(3x+1)^2=10^2`

<=> `3x+1=10` hoặc `3x+1=-10`

<=> `x=3` hoặc `x=-11/3`

Answer 2

\(\left(3x+1\right)^2=25.4\\ < =>\sqrt{\left(3x+1\right)^2}=\sqrt{100}< =>3x+1=10\\ < =>3x=9\\ < =>x=3\\\)

Answer 3

Ta có : (3x + 1)² = 25 . 4

=> (3x + 1)² = 100

=> (3x + 1) = 10²

=> 3x + 1 = 10

=> x = 3