Đáp án:
`a) (x-1)^2 +(x-2)^2 = 2(x +4)^2 -(22x +37)`
`<=> 2x^2 - 6x + 5 = 2x^2 - 6x - 5`
`<=> 2x^2 - 6x + 5 - 2x^2 + 6x + 5 = 0`
`<=> 10 = 0` (vô lí)
Vậy `S=∅`
`b) (4x +3)(4x - 3)-(4x-5)^2= 46`
`<=> 40x - 34 = 46`
`<=> 40x = 46 + 34`
`<=> 40x = 80`
`<=> x= 80/40`
`<=> x= 2`
Vậy `S={ 2}`