What multiplies to -1920 and adds to 56?

Question

Elnora Hickle · Answer

-1864

Wiki User · Answer

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  I will solve all your math problems with detailed solutions. Check my profile for more information.

What multiplies to -1920 and adds to 56?

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