Find f(a), f(a + h), and the difference quotient (f(a + h) − f(a))/h where h ≠ 0.
f(x) = 3x2 + 7
f(a) = ??
f(a + h) = ??
(f(a + h) − f(a))/h = ??

To be clear, f(a + h) − f(a) is all divided by h.