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1. f(x)=x^3-5x^2-4x+20
2. f(x)=4-2x^2+x^4

f(7)=5f(-1)

f(-1)=3

f(0)=-2f(3)

f(2)=12

f(-2)=12

f(1)=12

f(5)=0

f(0)=4

f(1)=3