It is either (-3)^2 = +9or -3^2 = -9
It is not clear which one you require.
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Any number to the first power is that number - so 3 to the first = 3 Any number to the second power is that number multilpied by itself, so 3 to the second = 3 x 3 Any number to the third power is itself to the second power multiplied by itself, so 3 to the third = 3 x 3 x 3 and so on.. so three to the fourth = 3 x 3 x 3 x 3 As three is a prime number there are no other factors.
4 to the second power
You could write "3 to the fourth" or "3^4" or 34.
3
561