They are called the solutions or roots of the equations.
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Zero, always.
It means you are required to "solve" a quadratic equation by factorising the quadratic equation into two binomial expressions. Solving means to find the value(s) of the variable for which the expression equals zero.
The domain is the (x) of the equation, and if (x) is zero then that is the domain. So yes the domain can be zero.
0. Any number multiplied by zero equals zero.
The values are : All even numbers and zero.