(3x+2)(x-3)=x-12怎么做
问题描述:
(3x+2)(x-3)=x-12怎么做
好的可以多加,
答
3x²-7x-6=x-12
3x²-8x+6=0
△=(-8)²-4×3×6=-8方程无解在帮一道,嘿嘿。态度好即可采纳,本人一贯风格。y²+2my+2m²-1=0y²+2my+2m²-1=0 , (y+m)²=1-m²△=4m²-4(2m²-1)=4-4m²=4(1-m²)当1-m²≥0即-1≤m≤1时,关于y的方程y²+2my+2m²-1=0有解,y=-m±√(1-m²)当1-m²1时,关于y的方程y²+2my+2m²-1=0无解