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W(x) = 7x³-21x+2x²-6=7x(x²-3)+2(x²-3)=(x²-3)(7x+2)
b) W(x)= x⁵+3x⁴-4x³-12x²
W(x) = x⁴(x+3)-4x²(x+3)=(x+3)(x⁴-4x³)
c) W(x)= 2x⁴+x³+4x²+x+2 = x³(2x+1)+x(2x+1)+2=(x³+x)(2x+1)+2
d) W(x)= x³-13x-12 = x³-12x-x-12