Related Post: 2x 3 4 X 5 X 1 2 3 X 4 5 X 1 3 2x 3 )( X 5 )( 4x 1 2x 3 4 X 2 X 1 5 Derivative 3x 2 )( X 4 )- 3 X 5 )( X 1 )= 0 2 3 X 4 7 5 X 4 1 2 3 X (- 9 8 X (- 4 5 X (- 1 3 2 4 X )+ 5x 10 8 2x 3 )- 4 X 5 )= 10 4 X 5 )( X 1 )- 3 2x 7