Answers

2016-07-03T17:55:17+08:00
    expression        x² + 8x
    to make it a perfect square trinomial
    you have to add    ( 8/2)² = 16   / divide the coefficient of  x  & squared it
    thus the perfect square trinomial   =   x²+ 8x +16

                                                           =  (x + 4)²    / take the sqrt of x  & 16
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