Solve for x_2
x_{2}=225
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289=8^{2}+x_{2}
Calculate 17 to the power of 2 and get 289.
289=64+x_{2}
Calculate 8 to the power of 2 and get 64.
64+x_{2}=289
Swap sides so that all variable terms are on the left hand side.
x_{2}=289-64
Subtract 64 from both sides.
x_{2}=225
Subtract 64 from 289 to get 225.
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