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W(x)=x(4x²-1/9)=x(2x-1/3)(2x+1/3)
b)
W(x)=4x³(4x²-1)=4x³(2x-1)(2x+1)
c)
W(x)=2x²(x²-3)=2x²(x-√3)(x+√3)