it depends,if y = 0 the answer is -12 if y = 5 then the answer is 368
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y2-4y-32 = (y+4)(y-8) when factored
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.
2x squared minus 4
This simplifies to 3x-6+4y.
(4+x) (2x-3)