Question

5(x-3)(x-7)-(5x+1)(x-2)=8

Answer 1

`5(x-3)(x-7)-(5x+1)(x-2)=8`

`<=>5x^2-35x-15x+105-5x^2+10x-x+2=8`

`<=>-41x=-99`

`<=>x=99/41`

Vậy `S={99/41}`

Answer 2

`5(x-3)(x-7)-(5x+1)(x-2)=8`

`<=>5(x^2 -3x-7x+21)-(5x^2+x-10x-2)=8`

`<=>5x^2 -50x+105-5x^2 +9x+2=8`

`<=>-41x+107=8`

`<=>107-8=41x`

`<=>41x=99`

`<=>x=99/41`

Vậy `S={99/41}`