Answers

2014-07-27T15:41:34+08:00
F(x) =      x² - 18x + 65
       = 1( x- 9)² +65 - 81          /     (18/2)² = 8
        = 1(x -9)² - 16
to complete the square we added 81
so to balance the expression we added - 81
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