Mathematics
Senior High
Solved
至急お願いします
α+βが-2なのに式にあてはめると+2にになるのはどうしてですか？
教えてください
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170 (高次式の値)
α=-1+√5i, β=-1-√5iについて
a+β= (−1+√5i) +(-1-√5i) = -2,
aβ=(-1+√5i)(1-√5i)
=(−1)² – (√√5 i)² = 6
α, βを解とする2次方程式の1つは
x2+2x+16=0
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