Which of the following is an example of a quadratic equation?

OPTION C.

Step-by-step explanation:

 The standard form of a Quadratic equation is:

Where "a", "b", and "c" are numerical coefficients ()

The term is the Quadratic term,.

The term   is the Linear term.

The term   is the Constant term.

  A Quadratic equation whose Linear term is not present, is called a "Pure quadratic equation", and can have the following form:

Based on this, we can determine that the equation shown in Option C is a Pure quadratic equation, because it has a Quadratic term and a Constant term:

It can be written as:

X² = 125

Step-by-step explanation: The equation X² = 125 is called a quadratic equation because we have a squared term as our highest power.

thus, the first answer choice, y = sec x, is the correct one