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# how do I find the dot product of (1 - i , 2+3i) and (2 + i, 3 - 2i) ?

how do I find the dot product of (1 - i , 2+3i) and **(2 + i, 3 - 2i)** ?

I know there is something with conjugates of a2, and b2 (I bolded them) I get 1 + 10 i and the book says 6 +21i... this doesn't match....