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OpenStudy (anonymous):
I will award medals and i will fan!!!!! What number should be added to the expression x2 + 6x to change it into a perfect square trinomial? A. 3 B. 6 C. 9 D. 12
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OpenStudy (anonymous):
c
OpenStudy (anonymous):
how
OpenStudy (anonymous):
9 is the only perfect square in those set of answers.
OpenStudy (anonymous):
what you would have to do is complete the square so it would be x^2 +6x + 9. If you factor that it is (x+3)(x+3). so the answer is C
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