22 = 4
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-2 to the second power is (-2) x (-2) = +4
2 to the 2nd power is 4.
2-2 = 4
If you have 3 to the power 2 to the power 2, without any parentheses, you have to calculate from right to left. In this case, calculate 2 to the power 2; then calculate 3 to the power (whatever the result you get). If there are parentheses, do the calculation in parentheses first.
22x52x7 4x25x7 100x7 700