`(x - 3x^2)(x + 6) + x(3x^2 + x) = 24 - 16x^2`
`= -17x^2 + 6x - 3x^3 + x(3x^2 + x) = 24 - 16x^2`
`= -17x^2 + 6x - 3x^3 + 3x^3 + x^2 = 24 - 16x^2`
`= -17x^2 + 6x + x^2 = 24 - 16x^2`
`= -16x^2 + 6x = 24 - 16x^2`
`= -16x^2 + 6x + 16x^2 = 24`
`6x = 24`
`x = 24/6`
`x = 4`
Cho mình xin hay nhất nha bạn!!!!
@Drew Mclntyre