What is the difference between the two sentences?

「その特のなぞを解くに、自分の頭を働かせた。」

「その特のなぞを解くに、自分の頭を使った。」
CC BY-SA 4.0
2018-06-03T09:54:07.547
59205
2018-06-08T19:35:03.220
29302
question
nuances verbs
What is the difference between「働かせる」and 「使う」?
Both sentences have the same meaning, as in "using my brains".
CC BY-SA 4.0
2018-06-08T19:35:03.220
59322
2018-06-08T19:35:03.220
26563
59205
answer