A stand-up comedian uses algebra in some jokes, including one about a telephone recording that announces "You have just reached a pure imaginary number. Please multiply by i and dial again." Explain the joke.

Answer:i * i = -1Step-by-step explanation:W hen you multiply an imaginary number or i number by another imaginary pure number, the answer is going to be a negative number, due that i *i= -1. The joke is funny because if you do what the recording is saying there you won't have a pure imaginary number and if you dial again, the same would happen again and again.