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Rababe
@Rababe
April 2019
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Bnjr svp factorisez ces expressions :
A = x(x-2) - 5(2-x)
B = 4x² - 12x +9
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trudelmichel
Verified answer
A=x(x-2)-5(2-x)=x(x-2)+5(x-2)=(x-2)(x+5)
B=4x²-12x-9 =4x²-12x+3²
identite remarquable a²-2ab+b²=(a-b)²
4x²-12x+3²=(2x-3)²
1 votes
Thanks 1
Commentaires
Bonjour ,
A = x(x-2) - 5(2-x) ⇒ 2-x =
- (x-2)
= -x +2 =
2 - x
A = x(x-2) + 5(x-2)
A = (x-2) (x+5)
B = 4x² - 12x + 9
B = (2x)² - 2 × 2x × 3 + 3²
B = (2x-3)²
2 votes
Thanks 2
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Verified answer
A=x(x-2)-5(2-x)=x(x-2)+5(x-2)=(x-2)(x+5)B=4x²-12x-9 =4x²-12x+3²
identite remarquable a²-2ab+b²=(a-b)²
4x²-12x+3²=(2x-3)²
A = x(x-2) - 5(2-x) ⇒ 2-x = - (x-2) = -x +2 = 2 - x
A = x(x-2) + 5(x-2)
A = (x-2) (x+5)
B = 4x² - 12x + 9
B = (2x)² - 2 × 2x × 3 + 3²
B = (2x-3)²