We spent the majority of our time correcting Marcos' homework. I had him work on the board. I reminded him of the rules for adding/subtracting radicals - you can only add and subtract them if their radicands are equal. You can, however, multiply them if the radicands are unlike. After working through many of them, I could tell that Marcos understood the rules better, and he was able to do more challenging problems.
I introduced Graphing Square Root Functions. The radicand in a square root function cannot be negative, because we cannot take the square root of a negative number. This determines the domain of the function. We also looked at how adding and subtracting a constant under the radicand, as well as outside the radicand, shifts the graph up, down, left, or right. Marcos's assignment is p. 640 (2-28 even).