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1 solution
R 2 = 5 0 2 + ( R − 8 ) 2
R 2 = 2 5 0 0 + R 2 − 1 6 R + 6 4
⟹ R 2 cancels out
1 6 R = 2 5 0 0 + 6 4
1 6 R = 2 5 6 4
R = 1 6 0 . 2 5