Răspuns:
a) x³+4x²-4x-16 = x²•(x+4)-4(x+4) = (x+4)(x²-4) =
= (x+4)(x-2)(x+2)
d) (x+1)³-x-1 = (x+1)³-(x+1) = (x+1)•[(x+1)²-1] =
= (x+1)(x+1-1)(x+1+1) = x(x+1)(x+2)
g) x²+6x+9-4y² = (x+3)²-4y² = (x+3-2y)(x+3+2y)
j) x³-11x²+30x = x•(x²-11x+30) = x•(x²-5x-6x+30) =
= x•[x•(x-5)-6•(x-5)] = x•(x-5)•(x-6)
EVERGREEN
