bonjour
f (x) = ( 3 x + 4 )² - ( 4 x - 2 )²
1. f (x) = 9 x² + 24 x + 16 - ( 16 x² - 16 x + 4 )
= 9 x² + 24 x + 16 - 16 x² + 16 x - 4
= - 7 x² + 40 x + 12
2. f (x) = ( 3 x + 4 + 4 x - 2 ) ( 3 x + 4 - x + 2 )
= ( 7 x + 2 ) ( 2 x + 6 )
= 2 ( 7 x + 2 ) ( x + 3 )
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bonjour
f (x) = ( 3 x + 4 )² - ( 4 x - 2 )²
1. f (x) = 9 x² + 24 x + 16 - ( 16 x² - 16 x + 4 )
= 9 x² + 24 x + 16 - 16 x² + 16 x - 4
= - 7 x² + 40 x + 12
2. f (x) = ( 3 x + 4 + 4 x - 2 ) ( 3 x + 4 - x + 2 )
= ( 7 x + 2 ) ( 2 x + 6 )
= 2 ( 7 x + 2 ) ( x + 3 )