Question

What adds to be 0 and multiplies to be 3

Answer 1

There are no 'real' numbers that can do that.

This will be a good question to practice on when you
start learning "imaginary" numbers.

The pair of numbers that answer this question are

           + i√3
and     
            - i√3 .

The symbol ' i ' is the symbol used for   √(-1)  .