Question

Descompuneti in factori ireductibili expresia: x³+x²-9x-9

Answer 1

x2(x+1)-9(x+1) = (x+1)(x2-9)

Answer 2

 x³+x²-9x-9      x+1
-x³-x²               x²-9
=   = -9x-9
        +9x+9
         =   =

x³+x²-9x-9=(x+1)(x²-9)=(x+1)(x-3)(x+3)