A) (c²d²).(15c²+4d)
B) (15c²d²).(c+4d)
C) (15c²d²).(4c+d)
D) (c²d²).(15c-4d)

A) (1-X)(X-X³)
B) (X+1)(X³-X)
C) (1+X)(X+X³)
D) (1-X)(X+X³)

A) (5X²)(5X⁵-5X³-3X+1)
B) (5X²)(5X⁵-2X³+3X-1)
C) (5X³)(5X²+2X³+3X+1)
D) (5X²-1X)(5X⁵-4X)

A) (4x²y)(6 a²- 6xy²)
B) (6xy²)(4 a²+xy²)
C) (6xy²)(4 a²- 6xy²)
D) (5x²y)(4 a²- 6xy²)

A) (a-1)(2x+3y)
B) (a-1)(2x-3y)
C) (a-1)(3x+2y)
D) (a-1)(3x-2y)

A) (-2b)(a+b)
B) (2b)(a-b)
C) (2 a)(a+b)
D) (2 a)(a-b)

A) (X-1)(X+Y²)
B) (X+1)(X-Y²)
C) (X-1)(X-Y²)
D) (X+1)(X+Y²)

A) (a+1)(x-1)
B) (a-1)(x-1)
C) (a+1)(x+1)
D) (a-1)(x+1)

A) (x-3a)(3x²+1)
B) (3x+a)(3x²+1)
C) (3x-a)((3x²-1)
D) (x-3a)(3x²-1)

A) (4 a+b)(5x-2y)
B) (4 a+b)(5x+2y)
C) (4 a-b)(5x+2y)
D) (4 a-b)(5x-2y).