X² + 3x - 18 = 0
D = 3² - 4*(- 18) = 9 + 72 = 81
Ответ: - 6 ; 3
(x^3 -3x²) -36(x -3) =0
x²(x -3) -36(x -3) =0
(x -3)(x² -36) =0
x -3 =0, x =3
x² -36 =0, (x -6)(x +6) =0
x -6 =0, x =6
x +6 =0, x = -6
ответ: x= -6, x =3, x =6
Сократим на (х+6) x≠-6
(х+6)^2=36
(x+6)^2=6^2
x+6=6
x=0
23+3х-5х=3
-2х=-20
2х=20
х=10
a3 = 64
a10 = 22
a3= a1 + 2d 64 = a1 + 2d 42 = -7d
a10 = a1 + 9d 22 = a1 + 9d d = -6
ответ : -6