norrisj517 norrisj517

08-05-2018
Mathematics

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Which of the following equations is the result of completing the square on x 2 - 6x - 9 = 0?

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08-05-2018

If you want to complete the square on that, you do this:

x² - 6x - 9 = 0
x² - 6x = 9
x² - 6x + 9 = 9 + 9

x² - 6x + 9 = 18 is your equation.

If you want, I can keep going:

(x - 3)² = 18

x - 3 = +/- √18
x - 3 = +/- 3√2

x = 3 +/- 3√2

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