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bonjour,

(7x-6)(7x+2)-3(7x+2)

=  49 x² + 14 x - 42 x - 12 - 21 x - 6

=  49 x² + 49 x - 18  

Bonjour,

(7x - 6)(7x + 2) - 3(7x + 2)

= (49x² + 14x - 42x - 12) - (21x + 6)

= 49x² - 28x - 12 - 21x - 6

= 49x² - 49x - 18