Whenever you see a negative exponent (the negative 2nd power), take the reciprocal of the answer (put one over it):
x-y = 1/xy
So:
9-2 = 1/92 = 1/81 = 0.01234567901
The value of -3 to the second power is 9.
9
9
81
92 = 9*9 = 81.
3²=3x3=9
9 to the second power :))
(-9)2=81
9
9
9
81. 92 = 9 * 9 = 81