tag:blogger.com,1999:blog-4452694493610779687.post6242710208989109525..comments2010-03-06T18:47:54.702+05:30Comments on MATH HUB: Why is Negative * Negative = Positive ??? ( Trivia # 13 )Ankit Mahatohttp://www.blogger.com/profile/14165253638511269600noreply@blogger.comBlogger4125tag:blogger.com,1999:blog-4452694493610779687.post-60644747519256058072009-05-06T07:58:00.000+05:302009-05-06T07:58:00.000+05:30yup .. urs is another good explaination !!yup .. urs is another good explaination !!Ankit Mahatohttps://www.blogger.com/profile/14165253638511269600noreply@blogger.comtag:blogger.com,1999:blog-4452694493610779687.post-27203725517180782892009-05-05T00:33:00.000+05:302009-05-05T00:33:00.000+05:30almost same explaination as mine...
here it goes.....almost same explaination as mine...<br />here it goes...<br /><br />It is kind of like two wrongs make a right. Let us say that x and<br /><br />y are both positive. Then the meaning of -(x) + (y) is just y - x and (y) - -<br /><br />(x) = y + x, subtracting a negative number is the same as adding the positive<br /><br />number. Now, let us say n is a positive integer. Then n * x can be thought of<br /><br />as adding x to itself n times which explains why a positive number times a<br /><br />negative number is always negative. So, what does -(n) * x? Well,<br /><br />multiplication is commutative, i.e., x * y = y * x. So -(n) * x = x * -(n)<br /><br />or -(n) * x = (-1 * n ) * x = ( n * -1 ) * x = n * ( -1 * x ) because<br /><br />multiplication is also associative = n * -(x). All of which is to say that -n<br /><br />* x is the same as adding -x to itself n times. Therefore, -n * -x is the same<br /><br />as adding -(-x) to itself n times. And, I think we all agree that -(-x)<br /><br />better be +x. Hope this is not too confusing!eureka123http://get-set-go-jee.webs.comnoreply@blogger.comtag:blogger.com,1999:blog-4452694493610779687.post-70624599638109119332009-05-03T18:54:00.000+05:302009-05-03T18:54:00.000+05:30ewrewrAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-4452694493610779687.post-2479634609087175502009-05-01T21:08:00.000+05:302009-05-01T21:08:00.000+05:30Brilliantly explained!Brilliantly explained!Unknownhttps://www.blogger.com/profile/01908597371952913446noreply@blogger.com