-4
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y2 +8y + 16 = 0 can factor to (y+4) (y+4) = 0 so y+4 = 0 so y = -4
4 + 0 = 4
5x2 + 20x = 0 5x(x + 4) = 0 x = 0 and -4
x2 + 13x + 36 = 0 so (x+4)(x+9) = 0 so that x = -4 or x = -9
0, of course! 4+-4=4-4. One negative plus one positive equals one negative.