bonjour
a.(x-2)(3x+1)
= 3 x² + x - 6 x - 2
= 3 x² - 5 x - 2
b.(6-3x)(7x-5)
= 42 x - 30 - 21 x² + 15 x
= - 21 x² + 57 x - 30
c.(-x+3)(x-3)
= x² - 9
d.(-2-3x)(-4-5x)
= 8 + 10 x + 12 x + 15 x²
= 15 x² + 22 x + 8
Réponse :
A) (x-2)(3x+1)
B) (6-3x)(7x-5)
C) (-x+3)(x-3)
= -x²+3x+3x-9
= -x²+6x -9
D) (-2-3x)(-4-5x)
Explications étape par étape
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bonjour
a.(x-2)(3x+1)
= 3 x² + x - 6 x - 2
= 3 x² - 5 x - 2
b.(6-3x)(7x-5)
= 42 x - 30 - 21 x² + 15 x
= - 21 x² + 57 x - 30
c.(-x+3)(x-3)
= x² - 9
d.(-2-3x)(-4-5x)
= 8 + 10 x + 12 x + 15 x²
= 15 x² + 22 x + 8
Réponse :
A) (x-2)(3x+1)
= 3 x² + x - 6 x - 2
= 3 x² - 5 x - 2
B) (6-3x)(7x-5)
= 42 x - 30 - 21 x² + 15 x
= - 21 x² + 57 x - 30
C) (-x+3)(x-3)
= -x²+3x+3x-9
= -x²+6x -9
D) (-2-3x)(-4-5x)
= 8 + 10 x + 12 x + 15 x²
= 15 x² + 22 x + 8
Explications étape par étape