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Question

Using identities, evaluate 78x82


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Solution

To Evaluate : 78x82

78 can be written as (802) and 82 can be written as (80+2)

78x82=(802)(80+2)

Using the identity

(a+b)(ab)=a2b2

(802)(80+2)=(80)2(2)2(802)(80+2)=64004(802)(80+2)=639678x82=6396


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