Question

pls explain
chp:- expansion

hence proved we only make things difficult-_-
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Answer 1

$78 \times 42$

$= (60 + 18)(60 - 18)$

$= {60}^{2} - {18}^{2}$

$= 3600 - 324 = 3276$

Wasn't it easier?

Answer 2

78×42 = (60 + 18) × (60 - 18) = (60+18) × (60−18) = {60}^{2} - {18}^{2} = 3600 - 324 = 3276

Hope It Helps ☺️

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