15m4n4+6mn3+3m2n2
=m⋅n2(15m3n2+3⋅2n+3m)
Step 1 :Factor out m⋅n2 from the expression:
Step 2 :=m⋅n2(15m3n2+6n+3m)
Step 3 :=m⋅n2(15m3n2+3⋅2n+3m)