tolongg caranyaa.....

1)
a. 3x - 12 = 0
3x = 12
x = 4
b. x² - 6x + 8 = 0
(x - 4)(x - 2) = 0
x = 4 dan x = 2
2)
a. x² + x - 30 = 0
(x + 6)(x - 5) = 0
x = -6 dan x = 5
b. x⁴ - 16 = 0
(x² - 4)(x² + 4) = 0
(x - 2)(x + 2)(x² + 4) = 0
x = 2 atau x = -2