p(x)=2x^3+x^2-15x-12
g(x)=x+2
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⇒ p (x)=2x^3+x^2-15x-12 , g (x)=x+2
⇒put x= -2
⇒2 (-2)^3+(-2)^2-15 (-2)-12
⇒-16+4+30-12
⇒6
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