A quadratic equation is univariate: it has only one variable. A quadratic equation cannot have two variables. So, if b and c are known then it is a quadratic equation in a; if a and b are known it is a quadratic in c.
Another Answer:-
The question given is Pythagoras' theorem formula for a right angle triangle
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A quadratic equation.
Yes it is. The thing that makes it a quadratic equation is that "x squared" in there.
It is a quadratic equation that has 2 solutions
It is a quadratic equation.