(D) Use the Rational Function Theorem. The degrees of P(x) and Q(x)
are the same.(C) Remove the common factor x − 3 from numerator and denominator.(A) The fraction equals 1 for all nonzero x.(D) Note that .(B) Use the Rational Function Theorem.(A) Use the Rational Function Theorem.(E) Use the Rational Function Theorem.(C) The fraction is equivalent to ; the denominator approaches ∞.(D) Since , therefore, as x → −∞, the fraction → +∞.(D)