No, but any parabola can be transformed into the form y = x^2.
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An x2 parabola will always have one vertex, but depending on the discriminant of the function (b2-4ac) the parabola will either have 2 roots (it crosses the x-axis twice), 1 repeating root (the parabola meets the x-axis at a single point), or no real roots (the parabola doesn't meet the x-axis at all)
An equation for a parabola always has some type of irregular variable, usually a squared variable or higher.
Nope. False.
No. It can also be a circle, ellipse or hyperbola.
No, if the vertex of the parabola is (0, 0) it will only have one x intercept. The parabola might have zero x intercepts as well. For example: Y= x^2 + 1 would never touch the x line.