Determine the open intervals on which the function is increasing, decreasing, or constant. (Enter your answers using interval notation. If an answer does not exist, enter DNE.)
f(x) =
4x + 2, x ≤ -1
x^2 - 3, x > -1
2. Find the difference quotient and simplify your answer.
f(t) = 1/(t-2), [f(t)-f(1)]/(t-1), t ≠ 2