First, factorise both numerator and denominator:
(2x - 4) / (x2 - 4)
= 2(x - 2) / (x + 2)(x - 2)
= 2 / (x + 2).
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2x squared minus 4
1 over x2 - 4 is the multiplicative inverse of x2 minus four 1/x2 - 4
-144
The answer is 4 squared minus 2 squared as 4 squared is 16 minus 2 squared, which is 4, gives you 12 as an answer.
-- It's the product of (A/4 + b/5) times (A/4 - b/5). -- Its value will depend on the values of 'A' and 'b'. It will change whenever either of them changes.