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1 March, 12:48

Which of the following are solutions to the equation below?

Check all that apply

x2 - 8x + 16 = 5

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Answers (1)
  1. 1 March, 16:46
    0
    x = 4 ±sqrt (5)

    Step-by-step explanation:

    x2 - 8x + 16 = 5

    Complete the square

    (x-4) ^2 = 5

    Take the square root of each side

    sqrt ((x-4) ^2) = ±sqrt (5)

    x-4 = ±sqrt (5)

    Add 4 to each side

    x-4+4 = 4 ±sqrt (5)

    x = 4 ±sqrt (5)
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