Bonjour,
1) G = (4x+3)(2x+1)-(4x+3)(5x-6)
= 8x²+4x+6x+3-(20x²-24x+15x-18)
= -12x²+19x+21
2) G = (4x+3)(2x+1)-(4x+3)(5x-6)
= (4x+3)[(2x+1)-(5x-6)]
= (4x+3)(-3x+7)
3) a) (4x+3)(-3x+7) = -12x²+28x-9x+21 = -12x²+19x+21
b) on retrouve bien la forme développée de la question 1)
4) x = -1 ⇒ G = (4(-1)+3)(-3(-1)+7) = (-1)(11) = -11
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Bonjour,
1) G = (4x+3)(2x+1)-(4x+3)(5x-6)
= 8x²+4x+6x+3-(20x²-24x+15x-18)
= -12x²+19x+21
2) G = (4x+3)(2x+1)-(4x+3)(5x-6)
= (4x+3)[(2x+1)-(5x-6)]
= (4x+3)(-3x+7)
3) a) (4x+3)(-3x+7) = -12x²+28x-9x+21 = -12x²+19x+21
b) on retrouve bien la forme développée de la question 1)
4) x = -1 ⇒ G = (4(-1)+3)(-3(-1)+7) = (-1)(11) = -11