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2 April, 08:04

Add blank to each side of x^2-8x=9

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  1. 2 April, 09:57
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    Step-by-step explanation:

    To complete the square, take half of the second coefficient, square it, then add the result to both sides.

    (-8/2) ² = (-4) ² = 16

    x² - 8x + 16 = 9 + 16

    Solving:

    (x - 4) ² = 25

    x - 4 = ±5

    x = 4 ± 5

    x = - 1 or 9
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