Thank you for the opportunity to help you with your question!
a + 1 = sqrt(b + 1) so :
(a + 1)² = (sqrt(b + 1))² so :
a² + 2a + 1 = b + 1 so :
b = a² + 2a + 1 - 1 so :
b = a² + 2a = a(a + 1 )
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