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 quadratic expressions in one variable, including those for which a ≠ 1 (e.g., 3x^2 + 13x – 10), differences of squares (e.g., 4x^2 – 25), and perfect square trinomials (e.g., 9x^2 + 24x + 16), by selecting and applying an appropriate strategy