①두근이p보다클때두근의합:(α-p)+(β-p)=α+β-2p>0=>-(b/a)>2p∴-(b/2a)>p→축의위치두근의곱:(α-p)(β-p)=p²-(α+β)p+αβ=p²+(b/a)p+(c/a)>0.양
당신은 어느 그룹입니까?