Math Gold Medalist

Lor

2023 AMC 12B

Problem 12

For complex numbers $u=a+bi$ and $v=c+di$, define the binary operation $\otimes$ by\[u\otimes v=ac+bdi.\]Suppose $z$ is a complex number such that $z\otimes z=z^{2}+40$. What is $|z|$?

$\textbf{(A) }2\qquad\textbf{(B) }5\qquad\textbf{(C) }\sqrt{5}\qquad\textbf{(D) }\sqrt{10}\qquad\textbf{(E) }5\sqrt{2}$

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   Solution