1) t^2 + t - 6 = 0(t + 3)(t - 2) = 0t = -3 или t = 2
2) x^2 - 4x - 21 = 0(x - 7)(x + 3) = 0x = 7 или x = -3
3) x^2 + 9x + 18 = 0(x + 3)(x + 6) = 0x = -3 или x = -6
4) a^2 - 7a + 6 = 0(a - 6)(a - 1) = 0a = 6 или a = 1
5) d^2 - 4d - 60 = 0(d + 6)(d - 10) = 0d = -6 or d = 10
1) t^2 + t - 6 = 0
(t + 3)(t - 2) = 0
t = -3 или t = 2
2) x^2 - 4x - 21 = 0
(x - 7)(x + 3) = 0
x = 7 или x = -3
3) x^2 + 9x + 18 = 0
(x + 3)(x + 6) = 0
x = -3 или x = -6
4) a^2 - 7a + 6 = 0
(a - 6)(a - 1) = 0
a = 6 или a = 1
5) d^2 - 4d - 60 = 0
(d + 6)(d - 10) = 0
d = -6 or d = 10