Question 557034
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A perfect square trinomial is the square of two binomials, thus:


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ (x\ \pm\ c)(x\ \pm\ c)]


In the case of your four answers, *[tex \Large c] is a constant because the last term of all four of your trinomials is a constant.  But no matter whether the sign is positive or negative, the two end terms in a perfect square trinomial must be positive -- plus times plus is plus or minus times minus is plus, right?  One of your answers has a minus sign on the constant term.


John
*[tex \LARGE e^{i\pi} + 1 = 0]
My calculator said it, I believe it, that settles it
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