Question

\(\left(x-1\right)\left(x+2\right)>\left(x-1\right)^2+3\)

Answer 1

Ghi nhầm chin nhỗi :(

`(x-1)(x+2)>=(x-1)^2+3`

`<=>(x-1)(x+2-x+1)>=3`

`<=>3(x-1)>=3`

`<=>x-1>=1`

`<=>x>=2`

Vậy `S={x|x>=2}`

Answer 2

`(x-1)(x+2)>=(x-1)^2+3`

`<=>(x-1)(x+2-x+1)>=3`

`<=>3(x-1)>=3`

`<=>x-1>=1`

`<=>x>=1`

Vậy `S={x|x>=1}`