Question

first step = (P -12)² -2(P -12)=0 this becomes (P -12){ P -12 -2} = 0 in the next step. explain how fast please its urgent

Answer 1

By taking (P-12) common on whole
you are left with (P-12)-2(1)
= P-12-2...
I.e (P-12){(P-12)-2.(1)}