1123581321 Posted February 10, 2011 Share Posted February 10, 2011 I was wondering does the rule - a plus and minus equals a minus - mean/hold the same for an expression such as -2 + 6 and 2 + (-6) and why is it so.. Link to comment Share on other sites More sharing options...
Shadow Posted February 10, 2011 Share Posted February 10, 2011 (edited) I'm not sure I understand what you're asking, but I'll give it a shot; it's not "a plus and a minus give a minus", it's "plus times a minus gives a minus". Since you're adding two numbers and not multiplying them, it doesn't hold. Edited February 10, 2011 by Shadow Link to comment Share on other sites More sharing options...
1123581321 Posted February 10, 2011 Author Share Posted February 10, 2011 ok, but i was more so asking if the same rule holds for working out both of the expressions i have.. and if so, what is it and how does it work? Link to comment Share on other sites More sharing options...
Bignose Posted February 11, 2011 Share Posted February 11, 2011 Well your two expressions aren't equal. -2 + 6 = 4. Whereas 2 + (-6) = 2 - 6 = -4. the + (-6) is because you are adding a negative 6. Link to comment Share on other sites More sharing options...
1123581321 Posted February 11, 2011 Author Share Posted February 11, 2011 ok Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now