one more than a number = ( x + 1 )
one less than the same number =
( x - 1 )
one more than the product of one more than a number with one less than the same number =
( x + 1 ) ( x - 1 ) + 1 =
x • x + x • 1 - 1 • x - 1 • 1 + 1 =
x² + x - x - 1 + 1 = x²
one more than the product of one more than a number with one less than the same number
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