Ta có:

`y^2=144`

`y^2=(+-12)^2`

`=>y=12` hoặc `y=-12`

`***` Trường hợp `1:y=12`

`x+16.12=89^2`

`x+192=7921`

`x=7921-192`

`x=7729`

`***` Trường hợp `2:y=-12`

`x+16.(-12)=89^2`

`x-192=7921`

`x=7921+192`

`x=8113`

Vậy `x in {7729;8113}`

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