If a<0,  b>0  then a b  is equal to

Verify selecting particular values of a  and b. Let q=−9  and b=4.  Then.a b=−94=(3 i)(2)=6i From option (a), we have −|a|  b=−|−9|  × 4=−36=−6 From option (b), we have |a|  b i=|−9|  ×  4  i=6i