2008-08-20, 10:48 PM
As the way it is written, without brackets, the result is -16, because according to the PEMDAS rule, you start with the exponent 4^2 and then multiply by -1.
Remember that -4^2 = -(4^2) = -1(4^2) =/= (-4)^2
Remember that -4^2 = -(4^2) = -1(4^2) =/= (-4)^2

