Question

Tìm x € N

2 . (x - 1)² - 3 = 5

Answer 1

\(2.\left(x-1\right)^2-3=5\)

\(\Rightarrow2.\left(x-1\right)^2=8\)

\(\Rightarrow\left(x-1\right)^2=4\)

\(\Rightarrow x-1=\pm2\)

+) \(x-1=2\Rightarrow x=3\)

+) \(x-1=-2\Rightarrow x=-1\)

Vậy \(x\in\left\{3;-1\right\}\)

 

Answer 2

2 . (x - 1)² - 3 = 5

2 . (x - 1)² = 5+3

2 . (x - 1)² = 8

(x - 1)² = 8 : 2

(x - 1)² = 4

x - 1 = 4 : 2

x - 1 = 2

x = 2 + 1

x = 3

Answer 3

2.(x-1)² - 3 = 5

2.(x²-1²) -3 = 5

2. (x-1⁾ = 5+3

2. (x-1⁾ = 8

x-1 ^{=8 : 2}

x²-1 = 4

x =4+1

x =5

Tui nghĩ z...

Answer 4

tui sai rùi

 

Answer 5

2. (x-1)²-3=5

=> 2.(x-1)²=5+3=8

=>(x-1)²=8:2=4

Mà: 2²=4 hoặc (-2)²=4

=> x-1=2 hoặc x-1=-2

=> x=3 hoặc x= -1

Mà: x\(\in N\)=> x\(\ge0\)=>x=3