write in logarithmic form Undefined examples: exponential & logarithmic expressions logarithm to e xponential form when we take base 8 tothe power of 2 we get 64 when we take base 144 tothe power of ½ we get 12 when we take base11 to the power of-2 we get 1/121 think 1441/2 = 12 11-2 = 82 = 64 write 1 121 undefined.