# I had asked that how: (-)(-)= (+). I saw that in that, (-) (+) = (-)... Prove how(-) (+) = (-). I am asking this again. Sorry for the impatience. I know experts have to see quite a many questions globally, so there may be some time taken to answer the questions.. So, just see to this a little soon.

$1)\left(+\right)\left(+\right)=+\phantom{\rule{0ex}{0ex}}2)\left(-\right)\left(-\right)=+\phantom{\rule{0ex}{0ex}}3)\left(+\right)\left(-\right)=-\mathrm{or}+\phantom{\rule{0ex}{0ex}}\mathrm{It}\mathrm{depends}\mathrm{on}\mathrm{the}\mathrm{sign}\mathrm{of}\mathrm{greater}\mathrm{number}.\phantom{\rule{0ex}{0ex}}\mathrm{Example}4-5=-1\mathrm{because}54\mathrm{so}\mathrm{we}\mathrm{will}\mathrm{consider}-\mathrm{sign}\mathrm{for}\mathrm{the}\mathrm{final}\mathrm{solution},\mathrm{similarly}\mathrm{if}\mathrm{we}\mathrm{have}6-5=1\mathrm{because}65\mathrm{so}\mathrm{we}\mathrm{will}\mathrm{consider}+\mathrm{sign}\mathrm{for}\mathrm{the}\mathrm{final}\mathrm{solution}.\phantom{\rule{0ex}{0ex}}4)\left(-\right)\left(+\right)=-\mathrm{or}+\phantom{\rule{0ex}{0ex}}\mathrm{It}\mathrm{depends}\mathrm{on}\mathrm{the}\mathrm{sign}\mathrm{of}\mathrm{greater}\mathrm{number}.\phantom{\rule{0ex}{0ex}}\mathrm{Example}-5+4=-1\mathrm{because}54\mathrm{so}\mathrm{we}\mathrm{will}\mathrm{consider}-\mathrm{sign}\mathrm{for}\mathrm{the}\mathrm{final}\mathrm{solution},\mathrm{similarly}\mathrm{if}\mathrm{we}\mathrm{have}-4+5=1\mathrm{because}54\mathrm{so}\mathrm{we}\mathrm{will}\mathrm{consider}+\mathrm{sign}\mathrm{for}\mathrm{the}\mathrm{final}\mathrm{solution}.$

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