[tex]bonjour\\\\\\\\( 5 x - 1 ) ( 2 x - 3 ) - ( 6 x + 5 ) ( x - 4 ) \\= 10 x^{2} - 15 x - 2 x + 3 - ( 6 x^{2} - 24 x + 5 x - 20 )\\= 10 x^{2} - 17 x + 3 - 6 x^{2} + 24 x - 5 x + 20\\= 4 x^{2} + 2 x + 23 \\\\2 (x + 8 ) - (x + 6) = 2 x + 16 - x - 6 = x + 10 \\\\[/tex]
