Final answer:
The factored form of c(x) = -2x - 4 is c(x) = -2(x + 2). The quadratic formula does not apply as it is a linear function.
Step-by-step explanation:
The factored form of the linear function c(x) = -2x - 4 can be obtained by factoring out the greatest common factor (GCF), which in this case is -2. Factoring out -2, we get c(x) = -2(x + 2).
While the information provided about quadratic equations and the quadratic formula is insightful, it does not directly apply to this linear function, as it is not of the form ax² + bx + c = 0. Instead, this function is linear and does not require the quadratic formula for its solution.