4x²-8x-1=0 (2x+3)²=x²-6x+9 解方程.
问题描述:
4x²-8x-1=0 (2x+3)²=x²-6x+9 解方程.
答
①4x²-8x-1=0
x²-2x=1/4
﹙x-1﹚²=5/4
x-1=±√5/2
x1=﹙2+√5﹚/2,x2=﹙2-√5﹚/2
② ﹙2x+3﹚²=﹙x-3﹚²
2x+3=±﹙x-3﹚
x1=﹣6,x2=0.