Final answer:
The expression given is a quadratic equation, and we can solve it using the quadratic formula.
Step-by-step explanation:
This expression is a quadratic equation of the form at² + bt + c = 0, where the constants are a = 4.90, b = 14.3, and c = -20.0. Its solutions are given by the quadratic formula:
x = (-b ± √(b² - 4ac)) / (2a)
Substituting the given values into the formula, we can solve for x.