friend1: friend in front of me

friend2: friend beside friend1

friend3: friend in front of friend2

&amp;#x200B;

A couple of days ago (like one or two at the time of writing this post) I asked friend1 to answer the question: what is the square root of -1. He told me to tell him the answer while friend2 was trying to think of it. After a minute he told me that he would give me a pound(sterling not punch)if I told him the answer now instead of at the end of the lesson(this happened during math).I told him that I would agree to that so we were thinking of a person to give the pound to hold so no one could back down I thought to give it to friend2 and we agreed. When I told him the answer (which is i(which stands for imaginary))he turned to friend3 and took the money from him. I was pissed since when I asked for the money he said that i was the scammer because apparently telling the fact that there is an answer for the question: what is the square root of -1 by saying that its an actual number so they can be sure it exists. Currently he still wont give me the money even though friend2 also agreed that I should get the money that he offered