How do you solve the following equation:
\begin{align*}\sqrt{2017 + \sqrt{2017 - x}} &= x\end{align*}
I tried squaring it twice, but then I am left with quadratic equation that I can not solve.
I have injection $f \colon A \rightarrow B$ and I want to get bijection. Can I just resting codomain to $f(A)$? I know that every function i...
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