Just to add a note to Vinay's awesome answer, you want to be very careful with these two very similar things (especially if you're typing it in the calculator):
(-3)4 = 81
-(3)4 = -(34) = -(81) = -81
Hope this helps!
(-3)^4 = -3*-3*-3*-3
9 * 9
= 81
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