3x3 - 12 = 09x - 12 = 09x = 12x = 12/9x = 4/3
5x2 + 8 = 025x + 8 = 025x = -8x = -8/25
2x2 - 5x = 0x(2x - 5) = 0x = 0 or 2x = 5x = 0 or x = 5/2
Therefore, x = 0, 4/3, -8/25, or 5/2.
3x3 - 12 = 0
9x - 12 = 0
9x = 12
x = 12/9
x = 4/3
5x2 + 8 = 0
25x + 8 = 0
25x = -8
x = -8/25
2x2 - 5x = 0
x(2x - 5) = 0
x = 0 or 2x = 5
x = 0 or x = 5/2
Therefore, x = 0, 4/3, -8/25, or 5/2.