I have an exam tomorrow and have just spotted a flaw in my brain.

I am using a revision book with all the answers.

3 questions:

This is what I'm confused about.

so

But WHERE did the extra p come from. Surely thers only 1 p why is there now two?

My answer to this was

Next I've got:

How does this =

I simply don't understand.

I got stuck at:

Finally I have a mega confusion of another letter just dissapearing.

so

it then says "factorise to"

Where's the gone!? I see what they've done, but WHY!? again.

Will appreciate any help or nudges in the right direction. I also dont know which side of an equation something should go, if i -5 from both sides, do I put the -5 in front or behind the rest of the equation?