Page 2/ 3FACTORISATION. - https://www.toupty.com Classe de 3e
C= (−10 x+ 3) ×(−3x+ 8) −(x+ 3) ×
(−10 x+ 3)
C= (−10 x+ 3) ×(−3x+ 8 −(x+ 3))
C= (−10 x+ 3) ×(−3x+ 8 −x−3)
C= (−10 x+ 3) ×(−3x−x+ 8 −3)
C= (−10 x+ 3) ×(−4x+ 5)
D=−25 x2+ 9
D=√92
−√25 x2
D=√9 + √25 x×√9−√25 x
D=√25 x+√9×(3 −5x)
D=√25 x+√9×(−5x+ 3)
D= (5 x+ 3) ×(−5x+ 3)
E= (9 x+ 5) ×(8 x−2) + (9 x+ 5)2
E= (9 x+ 5) ×(8 x−2) + (9 x+ 5) ×(9 x+ 5)
E= (9 x+ 5) ×(8 x−2 + 9 x+ 5)
E= (9 x+ 5) ×(8 x+ 9 x−2 + 5)
E= (9 x+ 5) ×(17 x+ 3)
F= (9 x+ 4) ×(6 x+ 1) + 9 x+ 4
F= (9 x+ 4) ×(6 x+ 1) + (9 x+ 4) ×1
F= (9 x+ 4) ×(6 x+ 1 + 1)
F= (9 x+ 4) ×(6 x+ 2)
Corrigé de l’exercice 4
Factoriser chacune des expressions littérales suivantes :
A= (5 x+ 2)2−100
A= (5 x+ 2)2−102
A= (5 x+ 2 + 10) ×(5 x+ 2 −10)
A= (5 x+ 12) ×(5 x−8)
B=−(−7x+ 9) ×(5 x+ 6) + (2 x−8) ×(5 x+ 6)
B= (5 x+ 6) ×(−(−7x+ 9) + 2 x−8)
B= (5 x+ 6) ×(7 x−9 + 2 x−8)
B= (5 x+ 6) ×(7 x+ 2 x−9−8)
B= (5 x+ 6) ×(9 x−17)
C=−9x2+ 100
C=√1002
−√9x2
C=√100 + √9x×√100 −√9x
C=√9x+√100×(10 −3x)
C=√9x+√100×(−3x+ 10)
C= (3 x+ 10) ×(−3x+ 10)
D= 36 x2+ 24 x+ 4
D= (6 x)2+ 2 ×6x×2 + 22
D= (6 x+ 2)2
E= (6 x+ 4) ×(6 x+ 6) + (6 x+ 4)2
E= (6 x+ 4) ×(6 x+ 6) + (6 x+ 4) ×(6 x+ 4)
E= (6 x+ 4) ×(6 x+ 6 + 6 x+ 4)
E= (6 x+ 4) ×(6 x+ 6 x+ 6 + 4)
E= (6 x+ 4) ×(12 x+ 10)
F=x+ 6 + (7 x+ 9) ×(x+ 6)
F= (x+ 6) ×1 + (7 x+ 9) ×(x+ 6)
F= (x+ 6) ×(1 + 7 x+ 9)
F= (x+ 6) ×(7 x+ 1 + 9)
F= (x+ 6) ×(7 x+ 10)
Corrigé de l’exercice 5
Factoriser chacune des expressions littérales suivantes :
A=−36 x2+ (2 x−6)2
A=−(6 x)2+ (2 x−6)2
A= (2 x−6 + 6 x)×(2 x−6−6x)
A= (2 x+ 6 x−6) ×(2 x−6x−6)
A= (8 x−6) ×(−4x−6)
B= 64 x2−49
B=√64 x2
−√492
B=√64 x+√49×√64 x−√49
B= (8 x+ 7) ×(8 x−7)
C= 100 x2−80 x+ 16
C= (10 x)2−2×10 x×4 + 42
C= (10 x−4)2
D= (x+ 6) ×(x−5) + (3 x+ 5) ×(x+ 6)
D= (x+ 6) ×(x−5 + 3 x+ 5)
D= (x+ 6) ×(x+ 3 x−5 + 5)
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