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6. Factorise les expressions suivantes :
A = 4x² + 4x + 4
C = 9y2 - 3y + 27
B = -5.X? + 10.x + 15 D = 3y2 + y2
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Réponse:

A=4x²+ 4x +4

∆=4²-4×4×4=-48

x=la resemble vide

C = 9y²- 3y +27

∆=3²-4×9×27

=-963

x=la resemble vide

A = 4x² + 4x + 4

= 4(x² + x + 1)

B = -5x² + 10x + 15

= -5(x² - 2x - 3)

C = 9y² -3y + 27

= 9(y² - 1/3y + 3)

D = 3y² + y²

= 4y²