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OpenStudy (anonymous):
Which number completes the perfect square trinomial? x2 + 20x + ? A. 40 B. 100 C. 25 D. 80
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OpenStudy (zepp):
You take the constant in the middle, which is 20 in this case, get the square of half of this number and you'll get what you should put to complete the perfect square.
OpenStudy (zepp):
|dw:1340043147920:dw|
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