excel - Multiple IF, AND, OR statements -

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i trying create excel formula represent logic: 

if (b8 < 0 & a8 > 0), b8+a8  or  if (b8 < 0 & a8 < 0), b8-a8  or  if (b8 > 0 & a8 > 0), b8-a8

i can't seem syntax right.

alternatively, following put more closely/literally:

=if(and(b8<0,a8>0),b8+a8, if(and(b8<0,a8<0), b8-a8, if(and(b8>0,a8>0), b8-a8, "null?" )))

should trick. wasn't sure put if none of cases fail, showing "null?" .. change desired.

(but suspect pascx64's more efficient in long run ;) )


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