The opposite of x squared plus 5?
\(f(x)=- x^{2} +5\\\\x=0,\ so\ f(x)=-0^2+5=5\\x=1,\ so\ f(x)=-1^2+5=4\\x=2,\ so\ f(x)=-2^2+5=1\\x=3,\ so\ f(x)=-3^2+5=-4\)
