SOLUTION: Im trying to help my son with signed numbers. What are the basic rules for the signs in a equation? Its been a while. Thanks for your help! Linda

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Question 670482: Im trying to help my son with signed numbers. What are the basic rules for the signs in a equation? Its been a while.
Thanks for your help!
Linda
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
If you have variables, like +a+, +b+, and +c+
For multiplication:
+%28%2Ba%29%2A%28%2Bb%29+=+%2B%28a%2Ab%29+
+%28-a%29%2A%28-b%29+=+%2B%28a%2Ab%29+
+%28%2Ba%29%2A%28-b%29+=+-%28a%2Ab%29+
+%28-a%29%2A%28%2Bb%29+=+-%28a%2Ab%29+
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For addition with parentheses:
+a+%2B+%28+b+%2B+c+%29+=+a+%2B+b+%2B+c+
+a+%2B+%28+b+-+c+%29+=+a+%2B+b+-+c+
+a+-+%28+b+%2B+c+%29+=+a+-+b+-+c+
+a+-+%28+b+-+c+%29+=+a+-b+%2B+c+
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Hope this helps