Final answer:
The expression provided seems to contain a cubic component, which is not typical of a quadratic equation. If dealing with a quadratic, it is of the form ax² + bx + c = 0, and the leading term would be ax² with the leading coefficient as a.
Step-by-step explanation:
The expression given, 4-1/10x³, does not seem to correspond to a quadratic equation as the term has a cubic component (x³). However, if we are dealing with a quadratic equation, it is typically of the form ax² + bx + c = 0, and its solutions can be found using the quadratic formula.
For a quadratic equation with constants a = 4.90, b = 14.3, and c = -20.0, the solutions can be calculated by applying the quadratic formula: x = (-b ± √(b²-4ac)) / (2a). It is important to note that the leading term of a quadratic equation is ax², the leading coefficient is a, and the polynomial term refers to the individual terms that make up the expression (ax², bx, and c).