What is the restoring force of a spring with a spring constant of 4a and a stretched displacement of 3b?

The restoring force of a spring can be calculated using Hooke's Law, which states that the force is equal to the negative product of the spring constant (k) and the displacement (x) from its equilibrium position. In this case, the spring constant is 4a and the stretched displacement is 3b. Therefore, the restoring force (F) is given by F = -k * x = - (4a) * (3b) = -12ab.