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11 August, 06:15

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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Answers (1)
  1. 11 August, 09:20
    0
    What we do is to chop the 6x in half and then square it ... 1/2 of 6 is 3 and squared is 9.

    you have ... (x^2 + 6x + 9)
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