12
if the qustion was phrased as this WHAT NUMBERS MULTIPLIES TO 16 AND ADDS UPTO TOP -4 the answer would, There are no such numbers.
The factors of 16 are as follows
4*4 4+4=8
-4*-4 -4+-4=-8
16*1 16+1=17
-16*-1 -16+-1=-17
therefore there are no such factors
84
8
-16
-4 x -4 = +16 = 16 -4 + -4 = -8
2584
25
23
-4 plus/minus square root of 15.
4 1
-6
-56
1