$$f ( x ) = \frac { ( x + 8 ) ^ { 4 } + ( x - 6 ) ^ { 4 } } { 2 }$$
$\frac{\left(x+8\right)^{4}+\left(x-6\right)^{4}}{2}$
$x^{4}+4x^{3}+300x^{2}+592x+2696$
