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2 July, 15:36

Rewrite the function by completing the square. f (x) = x2-9x+14f (x) = x^{2} - 9 x + 14 f (x) = x 2 - 9x+14 f, left parenthesis, x, right parenthesis, equals, x, squared, minus, 9, x, plus, 14 f (x) = f (x) = f (x) = f, left parenthesis, x, right parenthesis, equals (x + (x + (x + left parenthesis, x, plus) 2+) ^2+) 2 + right parenthesis, squared, plus

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  1. 2 July, 15:37
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    x² - 9x + 14 by completing the square is (x - 9/2) ² - 25/4

    Step-by-step explanation:

    Given x² - 9x + 14

    To rewrite by completing the square, we need to write this in the form (a + b) ² or (a - b) ² without changing the value of the expression.

    (a + b) ² = a² + 2ab + b² (equation 1)

    (a - b) ² = a² - 2ab + b² (equation 2)

    x² - 9x + 14 = x² - 2 (x) (9/2) + (9/2) ² - 25/4 (equation 3)

    Comparing (equation 3) with (equation 1) and (equation 2), we can see that it takes the form of (equation 1), though, surplus of 25/4, where a = x, and b = 9/2.

    So

    x² - 2 (x) (9/2) + (9/2) ² = x² - 2 (x) (9/2) + 81/4 = (x - 9/2) ²

    Which means

    x² - 9x + 14

    = x² - 2 (x) (9/2) + 81/4 - 25/4

    = x² - 2 (x) (9/2) + (9/2) ² - 25/4

    = (x - 9/2) ² - 25/4

    And the square is completed.
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