f(2)=2*2³+2²-10=16+4-10=10
f(-2)=2*(-2)³+(-2)²-10=2*(-8)+4-10=-16+4-10=-22
f(2)+f(-2) =10+(-22)=-12
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f(2)=2*2³+2²-10=16+4-10=10
f(-2)=2*(-2)³+(-2)²-10=2*(-8)+4-10=-16+4-10=-22
f(2)+f(-2) =10+(-22)=-12