Question

Using identities, evalute:

1. 78× 82
2.( 102 ) √

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Answer 1

Answer:

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Step-by-step explanation:

78×82

⇒(80−2)(80+2)

⇒80^2 - 2^2

⇒ 6400−4

⇒6396

Answer 2

Answer:

1) 78 × 82

= (80-2)(80+2)

= (a+b)(a-b) = a2-b2

= 80^2 -2^2

= 6400-4

=6396

2) (102)

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