To solve these equations, you should understand that multiplication simple means adding a number (the multiplicand) to itself a specified number of times. For example 3 x 2, means adding 3 to itself 2times "3+3 = 6" , another example 5 x 3, means adding 5 to itself 3times "5+5+5 = 15"
The correct answer is: if is a root of , then is also a root of .
In fact, every polynomial has real and/or complex solutions. If all solutions are real, we're good. But if not all of them are real, then the complex ones come in couple of conjugate solutions. Since and are conjugate complex numbers, if one of them is a solution, the other must be as well.