Answer:
Step-by-step explanation:
I think you mean f(x) = x^2/(x+4). The parentheses matter.
f(2) = 2²/(2+4) = 4/6 = ⅔
:::::
f(3a) = (3a)²/(3a+4) = 9a²/(3a+4)
:::::
x ≠ 4, because division by zero is undefined.
Domain of f in interval form: (-∞,4)U(4,∞)
