bonjour
( 2 x - 1 )² + ( x - 7 ) ( 2 x + 1 )
= 4 x² - 4 x + 1 + 2 x² + x - 14 x - 7
= 6 x² - 17 x - 6
( x + 3 )² + 5 x ² - 8
= x² + 6 x + 9 + 5 x² - 8
= 6 x² + 6 x + 1
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bonjour
( 2 x - 1 )² + ( x - 7 ) ( 2 x + 1 )
= 4 x² - 4 x + 1 + 2 x² + x - 14 x - 7
= 6 x² - 17 x - 6
( x + 3 )² + 5 x ² - 8
= x² + 6 x + 9 + 5 x² - 8
= 6 x² + 6 x + 1