Объяснение:
3х² - 1² - (3х + 1) = 0
9х² - 1 - 3х - 1 = 0
9х² - 3х - 2 = 0
Д = 3² - 4 . 9 . -2
Д = 9 + 72
Д = 81
х₁ х₂ =
х₁ = = - = -
х₂ = = = =
Объяснение:
3х² - 1² - (3х + 1) = 0
9х² - 1 - 3х - 1 = 0
9х² - 3х - 2 = 0
Д = 3² - 4 . 9 . -2
Д = 9 + 72
Д = 81
х₁ х₂ =![\frac{3 +- 9 }{2 . 9}](/tpl/images/3825/1991/76bfb.png)
х₁ =
= -
= - ![\frac{1}{3}](/tpl/images/3825/1991/5506e.png)
х₂ =
=
=
= ![\frac{2}{3}](/tpl/images/3825/1991/d1391.png)