OK, I need help with two pretty basic questions. I keep making the same stupid mistakes. Please help!
Solve to the smallest equation.
1. (a-b)c2 + (b-a)c4
My working out so far:
= c2 [(a-b)+(b-a)c2)]
... then I don't know what to do. I know the answer is c2 (a-b), but how do I get there?
2. (x-y)2 -z2 / (x+z)2 -y2
So it occurs to me to use those math equations like following:
x2 +2xy +y2 -z2 / x2 + 2xz + z2 -y2
And then what? I'm not very good at maths...