I had a problem where I'm supposed to find subnets using the equation 2n-2 with n being the number of bits I borrow from the original subnet mask. If I wanted to borrow 3 bits, using traditional algebra it would be 2(3)-2 which equals 4 (subnets). But their example came up with 8 subnets so is that equation a misprint and should be 2 to the 3rd power (2x2x2 which equals 8)? And if that is true then I'm assuming I can ignore the (-2) part of the equation