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We can't answer that without knowing what the polynomial is.
There is no polynomial below.(Although I'll bet there was one wherever you copied the question from.)
x² + 8x + 15 = (x + 5)(x + 3)
What value, in place of the question mark, makes the polynomial below a perfect square trinomial?x2 + 12x+ ?
I think something's missing, but the answer is x(6x - 13)