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13 July, 14:30

Solve x2 - 8x = 20 by completing the square. Which is the solution set of the equation?

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  1. 13 July, 14:33
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    x=2, x = 6

    Step-by-step explanation:

    x² - 8x = 20 ⇌ x² - 2 (4) x = 4 + 16 ⇌ x² - 2 (4) x - 16 = 4 ⇌ (x - 4) ² = 4

    ⇌ x - 4 = 2 or x - 4 = - 2 ⇌ x = 6 or x = 2
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