8. An equation of the form ax+ bxc0 is known as a quadratic equation. The represent constant values. So x-17x 15 0 values of a, b, and c in the preceding example resents a quadratic equation where a 4, b -17, and c -15. The values of x that satisfy a particular quadratic equation, known as the roots of the equation, can be calculated by substituting the values of a, b, and c into the following two formulas: 2a