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W(-2)=(-2)³+2*(-2)²+c*(-2)+d=-8+8-2c+d=d-2c
d-2c=0 ⇒ d=2c
W(2)=2³+2*2²+2c+d=8+8+2c+d
16+2c+d=0
z pierwszego równania podstawiamy d=2c do drugiego i otrzymujemy
16+2c+2c=0
4c=-16
c=-4
d=2*(-4)=-8