Squared stands for 4.
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2 squared is 4, 3 squared is 9, 4 squared is 16
2
-2 squared is +4.
(-4)^2 - ( - 2)^2 = Factor ((-4) + (-2))((-4) - (-2)) = (-4 -2)(-4 + 2) = (-6)(-2) = (+12) Or more simply 16 - 4 = (+12)
The number times itself. For example 2 squared = 2x2=4 so 2 squared =4