I got this question in a test but it did not specify the variable with respect to which I was supposed to factorize
where it could be just $a(a-b)-c(b\pm c)$ but no common factor over all terms. I feel I may be missing something. The $\pm$ is there because I cannot remember whether the last sign was minus or plus.
Is there some trick to factorize this or is this question vacuous? What does it mean to factorize this?