Solve the equation for b, square root of b space plus space 1 end root equals space square root of b space plus 6 end root minus space 1

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Solve the equation for b,

square root of b space plus space 1 end root equals space square root of b space plus 6 end root minus space 1

Answer A. Negative two

Answer B. Negative three

Answer C. No solution

Answer D. Three