evaluate 9-7 × 9-8 using identities
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By IV identity,
(a+X)(a+y)= a²+a(X+y) +xy
81+9(-7-8)-56=81-191=110.
(a+X)(a+y)= a²+a(X+y) +xy
81+9(-7-8)-56=81-191=110.
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