I think I am missing a step...can someone verify or correct my work?

differentiate 2 * * 3 - 6 * 3 6 ) . 2 ( e 2x ) - 2. 9 ( x 8 6 ) ( 3 - ( 0 ) ? - x36 . 2 2 24 -2x 3x 2 ( x 3 6 ) 2 x 3-6 . 2 2 20 - 1 2x . 3 x ? ( x 3 - 6 X x 3 6 ) x - 6x 3 - 6x +36 x 3 6 . 2 e 2k 2 x 12 * 9 - 12 x +34 x 3 6 . 1 2x . 3 x 2 B (x - 6 ) e 2 x X 9 - 12 x 3 + 36 x 9- 12 x3+ 36 Be 2x x - 6 ) 9- 12 x 3 + 36 3e 2x (x(of ) * 2 6 )( x 3 - 6 30 2x x2 ( x 36 )