Find the limit: lim (x -> ∞) (3x^2 + 2)/(5x^2 - 4)

Practice Questions

Q1
Find the limit: lim (x -> ∞) (3x^2 + 2)/(5x^2 - 4)
  1. 0
  2. 3/5
  3. 1
  4. Infinity

Questions & Step-by-Step Solutions

Find the limit: lim (x -> ∞) (3x^2 + 2)/(5x^2 - 4)
  • Step 1: Identify the limit we want to find: lim (x -> ∞) (3x^2 + 2)/(5x^2 - 4).
  • Step 2: Notice that both the numerator (3x^2 + 2) and the denominator (5x^2 - 4) have the highest power of x as x^2.
  • Step 3: To simplify, divide every term in the numerator and the denominator by x^2.
  • Step 4: After dividing, the numerator becomes (3 + 2/x^2) and the denominator becomes (5 - 4/x^2).
  • Step 5: Now we rewrite the limit: lim (x -> ∞) (3 + 2/x^2)/(5 - 4/x^2).
  • Step 6: As x approaches infinity, the terms 2/x^2 and 4/x^2 approach 0.
  • Step 7: Therefore, the limit simplifies to (3 + 0)/(5 - 0) = 3/5.
  • Step 8: Conclude that the limit is 3/5.
  • Limit at Infinity – Understanding how to evaluate limits as x approaches infinity, particularly for rational functions.
  • Dominant Terms – Identifying the dominant terms in the numerator and denominator when x is very large.
  • Simplifying Rational Functions – Using algebraic manipulation, such as dividing by the highest power of x, to simplify the limit calculation.
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