Giúp mik vs ạ.Help meeee

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`a) sqrt{x}= 9`

`(sqrt{x})^2 =9^2`

`x=81`

Vậy `x=81`

`b) sqrt{x}=10`

`(sqrt{x})^2 =10^2`

`x= 100`

Vậy `x=100`

`c) sqrt{x+1} =11`

`(sqrt{x+1})^2 =11^2`

`x+1= 121`

`x= 121-1`

`x=120`

Vậy `x=120`

`d) sqrt{x-2} =12`

`(sqrt{x-2})^2 =12^2`

`x-2= 144`

`x= 144+2`

`x=146`

Vậy `x=146`

`e) sqrt{x-3} =13`

`(sqrt{x-3})^2 =13^2`

`x-3= 169`

`x= 169+3`

`x=172`

Vậy `x=172`

`f) sqrt{x-4} =14`

`(sqrt{x-4})^2 =14^2`

`x-4 = 196`

`x= 196+4`

`x=200`

Vậy `x=200`

`=====================`

`-` Công thức tổng quát:

`sqrt{x}= y` 

`⇒ (sqrt{x})^2= y^2` 

`⇒ x=y^2`