31.3.1 Addition and Subtraction: Joining Arrows Tip to Tail
Core ideaPicture this: just like with vectors, add real part to real part and imaginary to imaginary; geometrically you're sliding arrows together, (a+bi)±(c+di)
Module goal. We build the rules for adding, subtracting, multiplying, and dividing — learning both to grind through them algebraically and to see what addition and subtraction mean geometrically