00:01
All right, so we have an expression and we're trying to get rid of the parentheses.
00:07
So you would think that maybe you just have to drop the parentheses and have 8x minus 6x plus 7.
00:18
However, that's not the case because there's some invisible math going on here.
00:23
You're subtracting everything inside of these parentheses.
00:27
Or if you want to think about it, what you're really doing is you're multiplying.
00:32
Everything inside these parentheses by a negative 1.
00:37
So you have to distribute that negative among the terms that are inside of those parentheses.
00:43
Otherwise, you're going to get the incorrect answer.
00:46
So we're going to rewrite it as 8x, and then we have a negative 1 times a negative 6, so that's going to be minus 6x, so that would be correct.
00:57
And then this negative is going to change this positive to a negative 7.
01:04
So as you can see, what happens is anytime you're distributing a negative, i have a plus and a plus here.
01:15
Well, now i have a minus minus...