But what you said in 2. looks incorrect to me. They don't distribute - again, they just use the commutativity of the addition : a+b=b+a. Here : -x+y=y+(-x)=y-x.
Relevant question for someone who begins ^^ It's so good seeing you trying to understand !3.Next we have Now here is where I have a problem how can we know the values of both of these are 1 and -1? I am not certain how this is accomplished.
We have . This can be rewritten this way :
and hence the result. Does it look correct to you ?
When you'll advance into maths lessons, maybe you will learn that most of these steps are only here to guide you to the solution