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 trinomials of the form ax^2 + bx + c, where a = 1 or where a is the common factor, by various methods