W(X)=2x³ +7x² -7x +a
P(x)=(x+1)(2x² +bx -12)=2x³+bx²-12x+2x²+bx-12
b+2=7⇒b=5
a=-12
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W(X)=2x³ +7x² -7x +a
P(x)=(x+1)(2x² +bx -12)=2x³+bx²-12x+2x²+bx-12
b+2=7⇒b=5
a=-12