First, you apply the numbers into the problem. (-3 + (-5) (-3 - (-5). Then, you solve. (-3 + (-5) is equal to (-3 - 5), so the answer for that would be -8. (-3 - (-5) is equal to (-3 + 5), which is 2. Now, you multiply -8 and 2. So your answer would be -16. I hope this helps :)
