Factor $10x+50$10x+50.

Factor $k^2-81$k2−81.

Factor $3x+xz-39y-13yz$3x+xz−39y−13yz.

Factor $x^2+12x+36$x2+12x+36.

Factor polynomial expressions involving common factors, trinomials, and differences of squares, using a variety of tools and strategies