None does, since there is no polynomial below.
What value, in place of the question mark, makes the polynomial below a perfect square trinomial?x2 + 12x+ ?
64
-12
144
121
64
48
6.25
49
49
38
x2 + 22x + 121 to get this divide 22 by 2... then square the answer you get from that 22/2 = 11 112 = 121