Mathematics
Senior High
(2)の1行目から2行目の変換が分からないです！
(2)x2-2ax+a+1=0 を解くと,
4
x = a ± √ a ² − ( a + ² ) =
2つの解の差が1より,
2a+√4a²-4a-1_2a-√4a²-4a-1
a²-(a + 1) = ²a+√4a²-4a-1
2
a=
2
=1
2
√Aα²-4a-1=1 すなわち, 4²-4a-2=0
1±√3
20ROS NUE
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