They are: 21+6+2 = 29
-21 and -1
Multiples don't add. Addends add, like 13 + 14 + 15 = 42 but I suspect you want factors, specifically prime factors. 2 x 3 x 7 = 42
29, 11, 2
419
6 + 3 + 2 7 + 3 + 1
126 and -63 42 and 21 54 and 9
-49 and -7 -42 and -14 -28 and -28
Although negative numbers aren't usually considered factors, you can use -21, -3 and -2.
1848
X2 + 19X - 42 = 0What two factors of - 42 add up to 19?(X - 2)(X + 21)----------------------FOIL and see the function reappear.X = 2X = - 21
42 = 20 + 22
819