Sagot :
Bonjour,
Développer les expressions:
(x-7)(x+5)= x²-7x+5x-35= x²-2x-35 juste
(x-3)(x+4)= x²-3x+4x-12= x²+x-12 juste
(x-4)(x-2)= x²-4x-2x+8= x²-6x+8
(2x-7)(x-5)= 2x²-7x-10x+35= 2x²-17x+35 juste
(x+2)(2x+6)= 2x²+4x+6x+12= 2x²+10x+12
bonjour
[tex]( x - 7 ) ( x + 5 ) = x^{2} + 5 x - 7 x - 35 = x^{2} - 2 x - 35 \\\\( x - 3 ) ( x + 4 ) = x^{2} + 4 x - 3 x - 12 = x^{2} + x - 12\\\\( x - 4 ) ( x - 2 ) = x^{2} - 2 x - 4 x + 8 = x^{2} - 6 x + 8 \\\\( 2 x - 7 ) ( x - 5 ) = 2 x^{2} - 10 x - 7 x + 35 = 2 x^{2} - 17 x + 35 \\\\( x + 2 ) ( 2 x + 6 ) = 2 x^{2} + 6 x + 4 x + 12 = 2 x^{2} + 10 x + 12 \\\\[/tex]