Evaluate the limit: lim (x→9) (x² - 81)/(x - 9)
- A. 18 ✓
- B. 9
- C. 81
- D. 19
Correct answer
A. 18
Explanation
Factor the numerator: (x² - 81) = (x-9)(x+9). Cancel the (x-9) terms to get (x+9), then substitute x = 9 to get 18.
A. 18
Factor the numerator: (x² - 81) = (x-9)(x+9). Cancel the (x-9) terms to get (x+9), then substitute x = 9 to get 18.