Sagot :
bsr
x(x+1)(x+2)(x+3)+1
(x²+x)(x+2)(x+3)+1
(x³+2x²+x²+2x)(x+3)+1
(x³+3x²+2x(x+3)+1
x⁴+3x³+3x³+9x²+2x²+6x+1
x²(x²+3x+1)+3x(x²+3x+1)x²+3x+1
(x²+3x+1)(x²+3x+1)
(x²+3x+1)²
bye
bsr
x(x+1)(x+2)(x+3)+1
(x²+x)(x+2)(x+3)+1
(x³+2x²+x²+2x)(x+3)+1
(x³+3x²+2x(x+3)+1
x⁴+3x³+3x³+9x²+2x²+6x+1
x²(x²+3x+1)+3x(x²+3x+1)x²+3x+1
(x²+3x+1)(x²+3x+1)
(x²+3x+1)²
bye