Question

Find three pair of integers whose sum is ―120.​

Answer 1

Answer:

-60 -60

-100-10

-140+20

Answer 2

Answer:

Let the three integers be (x-1), x and (x+1). So their product is

(x-1)* x *(x+1) = 120, or

x(x^2–1) = 120, or

x^3-x = 120. So x = 5. Check 5^3–5 = 125–5 = 120.

So the three numbers are 4,5 and 6.

The sum of the three integers is 4+5+6 = 15