f(x) = x +9
g(x)=4-x²
Give a simplified expression for (f-g) (x) and give its domain.
A) -x² + x + 13; domain is all real numbers
B) -x²+x+ 13; domain is all real numbers except - 2 and 2
C) x² +x +5; domain is all real numbers
D) x²+x+5; domain is all real numbers except - 2 and 2
