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semoga membantu
A - B = 15 ---> A = B + 15 .... (2)
substitusi pers (2) ke pers (1) :
(B + 15)B = 1000
B^2 + 15B - 1000 = 0
(B + 40)(B - 25) = 0
B + 40 = 0 -----> B1 = - 40
B - 25 = 0 -----> B2 = 25
substitusi B1 dan B2 ke :
A = B + 15
A1 = -40 + 15 = - 25
A2 = 25 + 15 = 40
jadi kemungkinan bilangannya adalah (-25, -40) dan (40, 25)