Math: Less Than Two Roots: Challenge

1
y=x²-5x+10
(5/2 +u)(5/2 -u) = 10
5/2 * 5/2 -u² = 10
25/4 - 10 = u²
-3.75 = u²
none

2
y=x²-4x+4
(2+u)(2-u)=4
4-2u+2u-u²=4
u²=0
0ne

3
y = x²- 6x + 8
(3+u)(3-u) = 8
9 - u² = 8
u² = 1
two

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