How are quadratic equations different from linear equations?

Quadratics always have a squared value and linears don't. Quadratics have 2 answers and linears have 1.

In a linear equation:

- - the highest power of the variable that appears is the first power

- - the equation has one solution at most

In a quadratic equation:

- - the highest power of the variable that appears is the second power

- - the equation has two solutions