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Mathematics

Evaluate :

(4 - ab) (8 + ab)

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Answer

(4 - ab) (8 + ab)

= 4 (8 + ab) - ab (8 + ab)

= 32 + 4ab - 8ab - a(1+1)b(1+1)

= 32 - 4ab - a2b2

Hence, (4 - ab) (8 + ab) = 32 - 4ab - a2b2

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