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(x - y)2 - z2 is a difference of two squares (DOTS), those of (x-y) and z. So the factorisation is [(x - y) + z]*[(x - y) - z] = (x - y + z)*(x - y - z)
A fancy bold capital Z. It stands for the German word Zahlen meaning "numbers."
in algebra, a 'value' is what a certain letter stands for. for instance... if z = 6 and the below is a balanced scale... .............................................. z x z Find the value of x = 12 because 2 sixes, (2 zs) equals 12!!!
The symbol is Z from the German word for integers, zahl.
The question is underspecified. As it stands, y can have any value.