q^3+3q²-2=0怎么解
问题描述:
q^3+3q²-2=0怎么解
答
q³+q²+2q²-2=0
q²(q+1)+2(q+1)(q-1)=0
(q+1)(q²+2q-2)=0
q=-1,q=-1-√3,q=-1+√3