X 2 20x 21 July 8, 2019 16 32 64 128 X 2 20x 21 0 X 2 20x 21 complete the square X 2 20x 21 factored X 2 20x 100 21 X 5 20x 3 20x 2 21x 20 X 4 21x 2 20x X 4 21x 2 20x 0