That's not possible to simplify, or give an answer to, unless you know what 'r' is.
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2x squared minus 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.
That factors to 3(r - 5)(r + 1) r = 5, -1
2