Question

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

y = x - 5
y = x 2 - 5
y = |6x|
y = 9

Answer 1

y^2-5. In the quadratic formula there is always an exponent.

Answer 2

y = x^2 - 5.

Explanation:

A quadratic equations has a squared variable ( like x^2) as its highest degree.

So it is y = x^2 - 5.