Question 387347
 If f(x)=5-x-x^2,
then f(-x) = 5+x-x^2
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find in simplest form: 
2f(x)-f(-x)
= 2(5-x-x^2)-(5+x-x^2)
= 10-2x-2x^2-5-x+x^2
= 5-3x-x^2
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cheers,
Stan H.