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Variable Equation. Equations typically always have (a) variable(s) so it's kind of like asking, "What a word that has letters called?" It's not quite the same, the question is valid. I'm just pointing out that it's a little redundant to say the following, but the best match for what you need would probably be: variable equation.
Take the square root of both sides of the equation
Without an equality sign it can't be considered to be an equation.
Without an equality sign the given expression can't be considered to be an equation.
On the list of choices that you posted along with the question, there are no phrases that describe a square well at all.