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11 December, 13:16

Solve x2 + 6x = 9 for x by completing the square.

a. x = - 6

b. x = 0

c. x equals plus or minus square root of 18 minus 3

d. x = x equals plus or minus square root of 18 plus 3

+1
Answers (2)
  1. 11 December, 13:28
    0
    Answer: c. x equals plus or minus square root of 18 minus 3

    Step-by-step explanation:

    1. x^2+6x + (6/2) ^2=9 + (6/2) ^2

    2. (x+6/2) ^2=18

    3. (x+3) ^2=18

    Answer: x = plus or minus root 18 minus 3

    Simplified would be x plus or minus 3 root 2 minus 3
  2. 11 December, 13:31
    0
    The right answer is C. Soo good luck
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