Answer :
a x b = -15
-3 x 5 = -15 or it can be -5 x 3= -15
how i got that is you ask what 2 numbers go into -15
3 and a -5 or it can be 5 and a -3
-3 x 5 = -15 or it can be -5 x 3= -15
how i got that is you ask what 2 numbers go into -15
3 and a -5 or it can be 5 and a -3