-6
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Because when you square a number - you're raising it to a positive power - and a negative number x a positive yields a negative result.
2 squared is 4, 3 squared is 9, 4 squared is 16
2
-2 squared is +4.
Squared stands for 4.
(-4)^2 - ( - 2)^2 = Factor ((-4) + (-2))((-4) - (-2)) = (-4 -2)(-4 + 2) = (-6)(-2) = (+12) Or more simply 16 - 4 = (+12)