Lin says, "When you add or multiply two complex numbers, you will always get an answer you can write in a + bi form."
Noah says, “I don't think so. Here are some exceptions I found:"
(7 + 2i) + (3 - 2i) = 10
(2 + 21) (2 + 2i) = 8i
a.
Check Noah's arithmetic. Is it correct?
b.
Can Noah's answers be written in the form a + bi, where a and b are real numbers? Explain
or show your reasoning.

Click an item in the list or group of pictures at the bottom of the problem and, holding the button down, drag it into the correct position in the answer box. release your mouse button when the item is place. if you change your mind, drag the item to the trashcan. click the trashcan to clear all your answers. complete this item. (enter letter variables in alphabetical order.) write 3a^2b^3c^5/8x^4y^3z using no denominator. (fraction line is necessary. use for multiplication between numbers.)