Bonjour pouvez m’aider merci
Exercice 3 : Développer et réduire : a) (x + 4)(x + 2)
b) (5x + 4)(2x + 1)
c) (3 – 2x)(x + 2)
d) (3x + 5)(-6x + 4)
e) (7 + 2x)2
f) (x + 5)(x – 3)(2 – 3x)
Exercice 3 : Développer et réduire : a) (x + 4)(x + 2)
b) (5x + 4)(2x + 1)
c) (3 – 2x)(x + 2)
d) (3x + 5)(-6x + 4)
e) (7 + 2x)2
f) (x + 5)(x – 3)(2 – 3x)
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Verified answer
Bonjour;
a) (x + 4)(x + 2)
= x² +2x +4x +8
= x² +6x +8
b) (5x + 4)(2x + 1)
= 10x² +5x +8x +4
= 10x² +13x +4
c) (3 – 2x)(x + 2)
= 3x +6 -2x² -4x
= -2x² -x +6
d) (3x + 5)(-6x + 4)
= -18x² +12x -30x +20
= -18x² -18x +20
e) (7 + 2x)²
= 49 +28x +4x² ( IR)
f) (x + 5)(x – 3)(2 – 3x)
= (x² -3x +5x -15)( 2-3x)
= (x² +2x -15)( 2-3x)
= 2x² -3x³ +4x -6x-30 +45x
= -3x³ +2x² +43x -30