Enter the key from Problem 1's side challenge to continue
Wrong key. Go back and solve Problem 1 first!
Consider this equation:
x² = x
This equation has two solutions. One of them is zero.
What is the OTHER solution?
Hint: What non-zero number, when you square it (multiply it by itself), gives you back the same number?
What is the square root of 16?
The answer is your key to unlock Problem 3