You should use your calculator for such simple sums. It is far quicker and involves fewer key depressions. I could tell you that the answer is 51 but how can you be sure that I did not make a mistake? Or that I am not messing about?
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32 plus 32 = 64
64 plus 64 plus 64 is 192.
b2 + 16b + 64 can be factorized to (b+8)(b+8). If they were equal to zero as in b2 + 16b + 64=0 then b = -8.
25
Numbers are unique. So the only number with a value of 64 is 64.