Because of the negative negative positive rule. If there are two negatives, they cancel out and become positive. If there is one negative one positive it becomes negative, if there is two positives it stays positive. These are the rules in math that are always prevalent and are the basis of math as well.

-2 X -3 = +6 because -2 and -3 are negative integers

Now remember, multiplying a negative number with a negative number you'll get a positive number. By multiplying a negative with a positive number you'll get a negative number.

For example,

-3 X 4 = -12 for this problem you'll get a negative because it's a negative number multiplied by a positive number

We'll recall the rules of multiplying 2 integers:

- multiplying 2 positive integers, you'll get a positive integer, too:

(+2)x(+3) = +6

- multiplying a positive integer and a negative integer, you'll get a negative integer:

(-2)x(+3) = -6

(+2)x(-3) = -6

- multiplying 2 negative integers, you'll get a positive integer:

That is why (-2)x(-3) = +6