Use the Zero Factor Principle: If the product of factors is zero, then what must at least one of the factors equal?
Then solve the two resulting linear equations.
The answer to any "solving" exercise can be checked by plugging it back in to the original problem. If you plug "0" in for "x", is the equation true? If you plug "-3" in for "x", is the equation true?
If so, your solution "checks" and it must be correct!