A quadratic equation is a polynomial equation of the second degree, meaning it has the highest exponent of 2. It is written in the general form

\$ax^2 + bx + c = 0\$

Explanation: Here the given image shows where x represents the unknown variable, a and b are coefficients and c is constant. The coefficient a cannot be zero.

A rational expression is an algebraic expression that represents a ratio or quotient of two polynomial expressions. It is essentially a fraction in which the numerator and denominator are polynomials.

Explanation: Here the given image shows the rational expression of the form \$ (p(x))/(q(x)) = (polynomial)/(polynomial) \$
where \$ q(x) ne 0 \$.