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C =  9 x² - 42 x + 49 - ( 15 x² - 35 x + 33 x - 77 )

C = 9 x² - 42 x + 49 - 15 x² + 35 x - 33 x + 77

C =   - 6 x²  - 40 x + 126

D  = ( 3 x - 7 ) ( 3 x - 7 - 5 x - 11 )

D = ( 3 x - 7 ) ( - 2 x - 18 )

D = - 2 ( 3 x - 7 ) ( x + 9 )

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