What 2 numbers times each other equals -4 and plus each other equals 4?

Answer 1

1) xy = -4

2) x+y = 4

From (2), x = 4-y

Substitute into (1)

(4-y)y = -4

4y-y2 = -4

y2-4y-4 = 0

After using quadratic formula to solve this, you'll the values of y, which are 4.8284 and -0.8284 after rounding up.

If you use 4.8284 to substitude in (2) as y, your x value is -0.8284

Other if you use -0.8284, you'll get 4.8284

Therefore the two numbers are 4.828427125 and -0.828427124