38 = 1*38, 2*19
48 = 1*48, 2*24, 3*16, 4*12, 6*8
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(48,1)(24,2)(16,3)(12,4)(8,6)
Prime numbers have one factor pair. Composite numbers have two or more pairs. (6,8) and (4,12) are two different factor pairs for 48.
1,2,3,4,6, 8,12,16,24 ,48
(12,1)(6,2)(4,3) (48,1)(24,2)(16,3)(12,4)(8,6)
The factor pairs of 80 are (80,1)(40,2)(20,4)(16,5)(10,8) None of them add up to 38. If that was -80, you could use 40 and -2.