Réponse :
Bonsoir
Explications étape par étape :
(2x+7)(6x+3) = 2x*6x +2x*3 + 7*6x + 7*3 = + 6x + 42x + 21 =
(-10x +5)(4x-7) = -10x*4x + -10x*-7 +5*4x +5* -7 = + 70x +20x - 35 =
9x-1)(2x-8) = 9x*2x + 9x* -8 + -1*2x + -1*-8 = - 62x -2x +8=
(6x +13)(-2x+5)= 6x*-2x + 6x+5 +12*-2x +13*5= +30x -24x +65=
(x+2)(-9x-1)=x*-9x +x*-1 +2*-9x +2*-1 = -x -18x -2 = -19x -2
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Réponse :
Bonsoir
Explications étape par étape :
(2x+7)(6x+3) = 2x*6x +2x*3 + 7*6x + 7*3 = + 6x + 42x + 21 =
(-10x +5)(4x-7) = -10x*4x + -10x*-7 +5*4x +5* -7 = + 70x +20x - 35 =
9x-1)(2x-8) = 9x*2x + 9x* -8 + -1*2x + -1*-8 = - 62x -2x +8=
(6x +13)(-2x+5)= 6x*-2x + 6x+5 +12*-2x +13*5= +30x -24x +65=
(x+2)(-9x-1)=x*-9x +x*-1 +2*-9x +2*-1 = -x -18x -2 = -19x -2