The square root of a negative is not a real number. In order to take the square root of a negative number, we use the imaginary number i. It is defined as the square root of -1, and i squared equals -1. I taught Hunter how to reduce radicals that had negative numbers by taking out the imaginary number i. We talked about complex numbers, which are comprised of an imaginary number and a real number. I taught him how to add, subtract, and multiply complex numbers. He did p. 278 (1-39 odd)