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5 March, 10:26

X2-8x+21 make the expression (x-h) 2+k is equivalent

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  1. 5 March, 11:45
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    X2-8x+21 = x² - 8x + (8/2) ² - (8/2) ² + 21

    = (x² - 8x + 16) - 16 + 21

    = (x - 4) ² + 5
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