두근의합과곱은x²계수가a인이차방정식의두근이α,β라고하면a(x-α)(x-β)=0이고ax²-a(α+β)x+aαβ=0이죠.그이차방정식이ax²+bx+c=0(a≠0)이면-a(α+β)=b이죠
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