Step-by-step explanation:
When solving a product, if the number of negative factors is even the result will be positive. If it's odd then the result will be negative.
In this case we have to multiply three negative numbers, which is an odd amount. Therefore the result is negative. We can solve the multiplication as if all the numbers were positive and then add the negative sign to the result:
Answer:
(-4)(-19)(-2) = -