I'm trying to understand how complex numbers get multiplied. when I multiply two numbers it always seems to give me an arbitrary amount. for example,
`complex(10,9)*complex(11,13)` equals `complex(-7,229)`and `complex(10,1)*complex(10,2)` equals `complex(98,30)`. is there a mathematical way to figure out 2 complex numbers multiplied and if so, what is is it?