Quick Homework Help

# how is the 7 changed to -7? ... would it not just stay positive?. and -2 squared is -4... i may just be confused from how i was shown by my teacher ⚑ Flag

by daniel417 at October 07, 2009

Here is how I think about this problem. Say a function like this X = Y We want to keep the left side of the value equal to the right side value at all time. So here it is: If you want to add 7 on the left side like this X+7, X+7 does not equal to Y because X = Y In order to make this true, you will have to make sure you counter the effect on the Y side so you minus 7 like this Y - 7 Therefore: X+7 = Y - 7 the +7 and -7 counter each other to 0. So lets say X-7 = Y I want to get ride of 7 on the left side of the equation, what do I do? I need to add value 7 on the ride side to counter the loss of the left side Therefore it is X = Y + 7.

Xzigraz October 07, 2009

As for why -2 squared doesn't equal to -4, here is how you should think this problem. -2 squared = -2 x -2 You need to see -2 as a whole number, not - and 2. by your logic, -2 square is -2 x 2 which the second number is not correct because it is not -2. And -2 x -2 = 4 therefore -2 squared = 4 What do you think about this?

Xzigraz October 07, 2009

dgsdgdfggggdfsdfs

moechris001 January 07, 2010

moechris stop putting on non-understandable answers

DanielJung August 04, 2010