If two non-zero rational numbers a and B satisfy the relation a + B = 0, can you judge whether their product a * B is positive or negative? If so, please explain the reason

If two non-zero rational numbers a and B satisfy the relation a + B = 0, can you judge whether their product a * B is positive or negative? If so, please explain the reason

A + B = 0, and the two numbers are not 0
So their product is negative