a) W(x)=x³+5x²-2x-10=x²(x+5)-2(x+5)=(x+5)(x²-2)=(x+5)(x+√2)(x-√2)
b) W(x)=2x³+x²-8x-4=x²(2x+1)-4(2x+1)=(2x+1)(x²-4)=(2x+1)(x+2)(x-2)
c) W(x)=x³-x²-9x+9=x²(x-1)-9(x-1)=(x-1)(x²-9)=(x-1)(x+3)(x-3)
d) W(x)=x³+5x²+x+5=x²(x+5)+(x+5)=(x+5)(x²+1)
