## Description

f(x)=15x

f(x)=x-6

f(x)= -5x^2

f(x)=x^4+4

## Explanation & Answer

f(x)= -5x^2 is the answer.................................................................................

f(x)=15x

f(x)=x-6

f(x)= -5x^2

f(x)=x^4+4

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