Add and subtract

On the complex plane, adding is walking the arrows one after another. Press , then . For $\displaystyle 12 - 6i$: type 12, press , type 6, and press the . Press , type 7, press , type 15, and press the . Then press , , 11, , 4, the , and . Press : the answer is 8. +5.i.

▶ Watch this step in the video (1:42:20)