Math, asked by TbiaSamishta, 1 year ago

41*39Find the value using expansion formula.

Answers

Answered by Anonymous
1
BONJOUR,
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we can write this like (40+1)(40-1)
then, we use identity
(a+b)(a-b) = a^2- b ^2
(40 + 1)(40 - 1) \\  = (40) { }^{2}  - 1 {}^{2}  \\  = 1600 - 1 \\  = 1599
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