-3
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8 to the third power is equal to 512. 5 to the second power is equal to 25.
That is 512 + 25 which is equal to 534.
5 + -8 = 5 - 8 = -3
You seem to be unaware of the fact that you could have obtained the answer much more easily and quickly by using the calculator that comes as part of your computer.
(-5)+(-8)+(-13)+(-16)+(-8)+11+0 11-16-13-8-8-5 -5-13-16-5 -18-21 -39
(-8 + b2) - (5 + b2) = -8 + b2 - 5 - b2 = -13
5+8 = 13
8 plus 5 equals 13
5 + -8 = 3 + 12 -3 is not equal to 15