>>Here we might go through the same idea that as we're multiplying 2 terms here times 2 terms here we would go through and use the foil method if we want to. However we might notice here that we have the sum of terms times the difference of the same 2 terms so we're multiplying conjugates. And when we're multiplying conjugates remember from before, the middle term goes out and we have a difference of squares. And we can think of this as the difference of squares if we want to or we can just follow through, follow our nose through it and go through like this. Two times 2, 4, now the middle term is gonna go out. We probably want to anticipate that. We can see it rather easily here 2 times 3I, 6I and then 2 times negative 3I is negative 6I so those 2 terms go out and then we have last times last which is plus times minus minus 3 times 3 9, I times I, I squared and then the I squared is negative 1. So this is negative 1 times negative 9, hmm that's 4 plus 9 or 13. Now it's important to notice here I think that when dealing with imaginary numbers, if we're multiplying conjugates we hit a real number as the result. Now that situation comes in real handy when rationalizing and we'll get to that in just a minute.