# Four times Four?

Algebra Level 5

For positive integers $$a, b,$$ and $$c,$$ we define $x^2 + c = |ax + b|.$

One member of this family of equations would be $$x^2 + 7 = |12x+20|$$, which has the solution set $$\{-9, -3, -1, 13\}$$.

Which of the following sets of four is a solution set of an equation of this family?

×