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P(x)=(x+1)(2x²+bx-1) = 2x³ + bx² - x + 2x² + bx - 1
P(x)= 2x³ + bx² - x + 2x² + bx - 1 = 2x³ + x² (b + 2) + x(b - 1) - 1
W(x)= 2x³+7x²-7x+a
P(x)= 2x³ + x² (b + 2) + x(b - 1) - 1
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