(x+1)(2x-2)-3=-5x-(2x+1)(3-x) giúp em với mn 31/10/2021 Bởi Arianna (x+1)(2x-2)-3=-5x-(2x+1)(3-x) giúp em với mn
(x + 1) (2x – 2) – 3 = -5x – (2x + 1) (3 – x) ⇔ ( 2x – 2x + 2x² – 2) – 3 = -5x – ( 6x -2x² + 3 – x) ⇔ 2x² – 2 – 3 = -5x – 6x + 2x² – 3 – x ⇔ 2x² – 5 = 2x² – 12x – 3 ⇔ 12x – 2 = 0 ⇔ x = $\frac{1}{6}$ Bình luận
(x + 1) (2x – 2) – 3 = -5x – (2x + 1) (3 – x)
⇔ ( 2x – 2x + 2x² – 2) – 3 = -5x – ( 6x -2x² + 3 – x)
⇔ 2x² – 2 – 3 = -5x – 6x + 2x² – 3 – x
⇔ 2x² – 5 = 2x² – 12x – 3
⇔ 12x – 2 = 0
⇔ x = $\frac{1}{6}$