Might have known this, but How?
'- x - = +'
'+ x + = +'
'- x + = -'
'+ x - = -'
but how do we get this, the proof..?😉😐
'+ x + = +'
'- x + = -'
'+ x - = -'
but how do we get this, the proof..?😉😐
Replies
-
Kaustubh KatdareI don't know if I can provide a 'mathematical proof'. But if you realise that 'x' (multiplication) is basically addition and '-' is basically 'taking out' then everything will quickly make sense. -
Keerthivasan RavisankarAnyone have any idea to this
😒😕 -
Ramani AswathSquare of any number, whether positive or negative is positive.
A negative number -n can be written as -1 x n. Consider -m x -n. This can be rewritten as ((-1) x m) x ((-1) x n) = ((-1) x (-1)) x (m x n) = (-1)^2 x mn = 1 x mn = mn.
As for the other two cases of multiplying two unequal signs, as #-Link-Snipped-# says it is just addition.
This article will help:
Multiplication of signed numbers -
Keerthivasan Ravisankar
it is related to my question but not related to it sir...!!!bioramaniSquare of any number, whether positive or negative is positive.
(-1)^2 x mn = (-1)(-1)xmn =1 x mn = mn.
(-1)^2 = [(-1)(-1)] =+1
but how do we get '- - =+' -
Ramani AswathSubtraction, addition, division and multiplication are just names. They get meaning only when attached to numbers. -m x -m is a valid statement, which is the reason for the earlier statement.
-
Keerthivasan Ravisankar#-Link-Snipped-#
do you have any guess..?
You are reading an archived discussion.
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