X - 4 3 5x = - 20 July 8, 2019 16 32 64 128 X 4 5x 3 4x 20 3 x 4 )+ 5x =- 20 X 4 5x 3 4x 2 20x 0 X 4 5x 3 10x 2 20x 24 5x 3 20x 2 x 4 X 4 5x 3 20x 16 X 4 5x 3 4x 20 factor X 4 5x 3 4x 20 factor completely F x )= x 4 5x 3 20x 16 X 4 5x 3 4x 2 20x X 4 5x 3 2x 2 20x 24 X 4 6x 3 5x 2 32x 20 X 4 − 4x 2 − 5x 3 20x 4x 2 − 16 2x 1 3 x 4 2 5x 20 6