Which of these is the depressed cubic form of x3+6x2+12x+5=0x^3 + 6x^2 + 12x + 5 = 0x3+6x2+12x+5=0?
t^3 - 3 = 0
t^3 + 6t + 5 = 0
t^3 + 1 = 0
t^3 - 6t = 0