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To solve this you need to set up the following two equations:
xy=-1920 (since the two numbers multiply to -1920)
x+y=56 (since they add to 56)
In the first equation, solve for x. We have x=-1920/y
Substitute this value for y in the other equation.
(-1920/y)+y=56
Multiply both sides by y
-1920 + y^2 = 56y
Subtract 56y from both sides.
y^2 - 56y - 1920 = 0
Solve this by completing the square or using the quadratic formula to get that y is equal to 80 or -24. You will see that 80-24=56 and (80)(-24)= -1920
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