Question

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Explanation:

1. By definition, the y-intercept of a polynomial (or any function) is the point where its graph crosses the y-axis, found by evaluating the polynomial at $x=0$.
2. Polynomials are classified by their degree; a degree 2 polynomial is specifically called a quadratic polynomial.
3. The leading coefficient (the coefficient of the highest-degree term) in a polynomial determines the steepness and width of its graph's curve, while also influencing the direction the ends of the graph point.

Answer:

1. y-intercept
2. quadratic
3. leading coefficient