Answer:
Im not sure exactly what you want the function to be. Because it can be any number. only the signs would change it
Step-by-step explanation:
okay so lets try this then..
if f(x) is an even number...let say 2
then f(-2)= 2x²+x+6
then it would be 2(-2²)+(-2)+6......-4
https://www.symbolab.com/solver/step-by-step/F%5Cleft(x%5Cright)%3D-F%5Cleft(x%5Cright)