please explain and solve
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69×71=4899
Hope it helps you
Hope it helps you
abdulmueej2004:
69×71
(70-1)(70+1)
70(70+1)-1(70+1)
4900+70-70-1
=4899
Answered by
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10).69×71
we can write it as
(70-1)× (70+1)
it looks like (a-b) (a+b) = a^2 - b^2 formula
a=70, b=1
a^2 =(70)^2 =4900
b^2 =(1)^2 =1
a^2-b^2 =4900-1
=4899 is answer
we can write it as
(70-1)× (70+1)
it looks like (a-b) (a+b) = a^2 - b^2 formula
a=70, b=1
a^2 =(70)^2 =4900
b^2 =(1)^2 =1
a^2-b^2 =4900-1
=4899 is answer
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