Réponse:

Slt,

A = 8x + 12 E= 3x² + 6x

= 4×2x + 4×3 = 3x×x + 3x×2

= 4(2x + 3) = 3x(x+2)

B = 15y + 10 F = 16y² + 20 y

= 5×3y + 5×2 = 4y×4y + 4y×5

= 5(3y + 2) = 4y(4y + 5)

C = 30u - 12 G = 18a² - 30a + 36

= 3×10u - 3×4 = 6×3×x×x- 6×5a + 6×6

= 3(10u - 4) = 6(3x² - 5a + 6)

D = -7a - 28 H = 40 b³ + 25b² + 10

= 7×(-a) - 7×4 = 5×8×b×b×b+ 5×b×b+5×2

= 7(-a - 4) = 5(8b³+ 5b² + 2)

I = 6u⁴ + 8u³ + 10u²

= 2u×3u×u×u + 2u×4u×u + 2u × 5u

= 2u(3u³ + 4u² + 5u)

Voilà.