4x 2 5x 3 0 July 8, 2019 16 32 64 128 2x 3 4x 2 5x 3 0 4x2 5x 3 0 discriminant 5x 2 4x 3 0 by completing square method X 3 4x 2 5x 0 3x 3 4x 2 5x 0 4x 3 19x 2 5x 0 X 3 4x 2 5x 20 0 X 3 4x 2 5x 6 0 5x 2 )( 4x 3 ≤ 0 0.4 5x 3 )= 2 0.5 4x )+ 7.2 2x 4 5x 3 4x 2 5x 2 0 4x 2 25 )( x 3 )= 0 X 4 x 3 4x 2 5x 3 0 4x 3 7x 2 5x 6 0 X 3 4x 2 5x 1 0
