Lin understands that expanding is using the distributive property, but she doesn't understand what factoring is or why it works. How can Kiran explain factoring to Lin? Lin asks Kiran how the diagrams with boxes help with factoring. What should Kiran tell Lin about the boxes?

Lin asks Kiran to help her factor the expression - 4xy-12x2 + 20xw. How can Kiran use this example to Lin understand factoring?​