Sagot :
A = (3x+3a)(x-3)
= 3x²-9x+3ax-9a
B = (-6-2t)(t-7)
= -6t+42-2t²+14t
= -2t²+8t+42
C = -3y²+6y+15y-30
= -3y²+21y-30
D = (2x²-6x)(2-x)
= 4x²-2x^3-12x+6x²
= -2xcube +10x²-12x
A= 3.(x²-3x+ax-3a)
A= 3x²-9x+3ax-9a
B= (-6-2t)(t-7)
B= -6t+42-2t²+14t
B= 8t+42-2t²
C= (-y-5)(3y-6)
C= -3y²+6y-15y+30
C= -3y²-9y+30
D=(2x²-6x)(2-x)
D= 4x²-2x³-12x+6x²
D= 10x²-2x³-12x