Question

Identify the identity that can be used and also evaluate (81 × 79) using the identity.

Answer 1

Answer:

==: 81 * 79

==: (80 + 1) (80 - 1)

==: 6400 - 1

==: 6399

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Answer 2

(80+1)(80-1)

$\red{(a - b)(a + b) = {a}^{2} - {b}^{2} }$

${80}^{2} - {1}^{2} \\ 6400 - 1 \\ 6399$