28: D( f ) = (−∞,−1) ∪ (−1,∞); f is continuous there.
y-intercept: f (0) = 0; x-intercepts: f = 0 gives x = 0.
f is not symmetric since D( f ) is not symmetric.
Limits at endpoints:

Interpretation as asymptotes:
Horizontal asymptote y = 0 at −∞.
Vertical asymptote at x = −1.
Horizontal asymptote y = 0 at ∞.

Now determine monotonicity using f ′.

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