39*41use (a+b (a-b)=a square-b square
Answers
Answered by
2
Answer:
1599
Step-by-step explanation:
(a+b)(a-b)=a^2-b^2
39*41
=(40-1)(40+1)
=40^2-1^2
=1600-1
=1599
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Answered by
1
Answer:
(40+1)(40-1)
=40(40-1)+(40-1)
=1600-40+39
=1600-1
=1599
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