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28 November, 04:23

Complete the square to solve the equation below.

x2 - 10x - 2 = 17

A. x = 5 +; x = 5 -

B. x = 5 +; x = 5 -

C. x = 5 +; x = 5 -

D. x = 6 +; x = 6 -

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Answers (1)
  1. 28 November, 06:11
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    We need to solve for the values of x by applying the method of completing the square in the given expression x² - 10x - 2 = 17. The solution is shown below:

    x² - 10x - 2 = 17

    Transpose - 2 to the right side such as:

    x² - 10x = 17 + 2

    Perform addition of 17 and 2

    x² - 10x = 19

    Add + 25 in both sides

    x² - 10x + 25 = 19 + 25

    x² - 10x + 25 = 44

    (x-5) (x-5) = 44

    Where (x-5) is a perfect square, then we have:

    (x-5) ² = 44

    x1 = + √44 - 5 = 1.6

    x2 = - √44 - 5 = - 11.6

    The answers are x1=1.6 and x2 = - 11.6.
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