**What number should be added to the expression x2 + 14x to change it into a perfect square trinomial?**(Points : 1)

7

14

28

49

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# to be added to x² +14x to change it to a perfect square trinomial is

(14/2)² = 7²

= 49

the trinomial is x² + 14x + 49 = (x +7)²

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