In my last doubt, I asked to give a formal proof, for (-)(+)=(-). I was asked by my maths teacher in school, that how when 2 unlike signs are multiplied, why the result is a negative value. Neha ma'am answered this last time, but it was not at all satisfactory.. I wanted one of the formal proofs like Brijendra Pal sir gave me for (-)(-)=(+)..Experts may prefer to that one, to make the answer satisfactory for (-)(+)=(-)...... Shruti ma'am you answered how (-)(-)=(+).....But I asked how (-)(+)=(-)...Hope you got... What I want to ask.. .

Hope you got what I wanted to ask... I wanted to ask formal proof for (-)(+)=(+)... According to the question.

no (-),(-) =(+)
(+),(+)=(+)
(-),(+)=(-)
hope it helps

FOR EXAMPLE-  (-2) + 3 =1, BECAUSE (+ ) (-) WE HAVE TO SUBTRACT   THEN WE HAVE TO CHECK THE SIGH   AGAR BADA NUMBER HAS  + SIGN THEN  THE ANSWER SHOULD BE +VE AND IF BADA NUMBER IS - SIGN THEN THE ANSWER SHOULD  BE -VE

2   (-3)+2= -1 BECAUSE GREATER  NUMBER HAS - SIGN
 

Experts please give the answer according to the context... and not give a proof saying that, when 2 different signs are multiplied it gives answer in negative. So, I won't be following the things as given by the students as they answer like this. 


Briendra sir gave me answer or how(-)(-) = (+)...


In almost (almost) the same format, please give answer to (+)(-) = (-)... I told almost the format... So, please be a little specific like him... and give the proof for (-)(+) = (-)

Only the difference is that,
Brijendra sir proved (-)(-) = (+)... and if any other expert or me (Brijendra sir)  is answering he/she has to answer and proof (-)(+) = (-)...

Hope that the experts understands me... 



Thanking You!