Ask Question
12 June, 15:31

X2+2x+8=0 solve by completing the square

+5
Answers (1)
  1. 12 June, 15:57
    0
    x = i sqrt (7) - 1 or x = - i sqrt (7) - 1

    Step-by-step explanation:

    Solve for x:

    x^2 + 2 x + 8 = 0

    Subtract 8 from both sides:

    x^2 + 2 x = - 8

    Add 1 to both sides:

    x^2 + 2 x + 1 = - 7

    Write the left hand side as a square:

    (x + 1) ^2 = - 7

    Take the square root of both sides:

    x + 1 = i sqrt (7) or x + 1 = - i sqrt (7)

    Subtract 1 from both sides:

    x = i sqrt (7) - 1 or x + 1 = - i sqrt (7)

    Subtract 1 from both sides:

    Answer: x = i sqrt (7) - 1 or x = - i sqrt (7) - 1
Know the Answer?
Not Sure About the Answer?
Find an answer to your question 👍 “X2+2x+8=0 solve by completing the square ...” in 📗 Mathematics if the answers seem to be not correct or there’s no answer. Try a smart search to find answers to similar questions.
Search for Other Answers