Question 384051
{{{9u^2-9v^2-36w^2+36vw=9(u^2-(v^2-4vw+4w^2))}}}
{{{9u^2-9v^2-36w^2+36vw=9(u^2-(v-2w)^2))}}}
{{{9u^2-9v^2-36w^2+36vw=9(u-(v-2w))(u+(v-2w))}}}
{{{9u^2-9v^2-36w^2+36vw=highlight(9(u-v+2w)(u+v-2w))}}}