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f (x) = ( x - 2) ( 3 + 7 x )

f (x) = 0  quand x =  2 ou - 3 /7

f (x) = 3 x + 7 x²  -  6 - 14 x  =  7 x² - 11 x -  6

7 x² - 11 x - 6 =  - 6

7 x² - 11 x - 6 + 6 = 0

x ( 7 x - 11 ) = 0

x = 0 ou  11 /7

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