Ask Question
7 November, 03:59

What are the real zeros of this function. x^3+2x^2-9x-18

+2
Answers (1)
  1. 7 November, 05:18
    0
    x = - 2, x = - 3, x = 3

    Step-by-step explanation:

    note that x = - 2 gives

    ( - 2) ³ + 2 ( - 2) ² - 9 ( - 2) - 18 = - 8 + 8 + 18 - 18 = 0

    Hence x = - 2 is a zero and (x + 2) is a factor

    x³ + 2x² - 9x - 18 : (x + 2)

    = (x + 2) (x² - 9)

    to find zeros, equate to zero

    (x + 2) (x + 3) (x - 3) = 0

    equate each factor to zero and solve for x

    x + 2 = 0 ⇒ x = - 2

    x + 3 = 0 ⇒ x = - 3

    x - 3 = 0 ⇒ x = 3
Know the Answer?
Not Sure About the Answer?
Find an answer to your question ✅ “What are the real zeros of this function. x^3+2x^2-9x-18 ...” in 📘 Mathematics if you're in doubt about the correctness of the answers or there's no answer, then try to use the smart search and find answers to the similar questions.
Search for Other Answers