(-8 + b2) - (5 + b2) = -8 + b2 - 5 - b2 = -13
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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.
in it's simplest form square root everything to get: a+b=8 i.e. a=8-b or b=8-a
(-5)+(-8)+(-13)+(-16)+(-8)+11+0 11-16-13-8-8-5 -5-13-16-5 -18-21 -39
2b2 + 8 para b = -3
5+8 = 13