If (b – 6) is one root of the quadratic equation x² – 6x + b = 0, where b is an integer, then what is the maximum value of b² ? - CDS Elementary Mathematics 2019 (II)

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If (b – 6) is one root of the quadratic equation x² – 6x + b = 0, where b is an integer, then what is the maximum value of b² ?