Factor 12m^2n^2-8mn+1
12m²n² -8mn +1[6mn-1]•[ 2mn-1][ 6mn•2mn + 6mn•-1 + -1•2mn +-1•-1]= [ 12 m²n² -6mn -2mn +1]= [ 12m²n2-8mn+1].........