Question 964327
Factorize the coefficients and constant term.  You can judge what to do from that.


{{{3x^3+3*6*x^2-5x-5*5}}}


{{{3(x^3+6x^2)-5(x+5)}}}


{{{3x^2(x+6)-5(x+5)}}}----------this is not a very meaningful factorization but nothing else to be done through grouping.  You made a small sign mistake.