A spring has an unstretched length of 10 cm . It exerts a restoring force F when stretched to a length of 12 cm .

For what total stretched length of the spring is its restoring force 3F?

At what compressed length is the restoring force 2F?

I keep doing this but I do not think Im using the right math to solve this

2 answers

F = kx
Doubling F means doubling x as k will not change.
1)16cm
2)6cm