Mathematics

Evaluate :
(9 - y) (7 + y)

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(9 - y) (7 + y)

= 9 (7 + y) - y (7 + y)

= 63 + 9y - 7y - y⁽¹⁺¹⁾

= 63 + 2y - y²

Hence,(9 - y) (7 + y) = 63 + 2y - y²

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