Question

2x²-10x=3用配方法怎么做

Answer 1

x²-5x+(5/2)²=(5/2)²+3(等式两边加上一次项系数一半的平方)
(x-5/2)²=3+(5/2)²
(x-5/2)²=36/4
X-5/2=±6/2
X-5/2=±3
X=±3+5/2
X1=5.5, x2=-0.5

Answer 2

2x²-10x=3
x²-5x=3/2
x²-5x+25/4=3/2+25/4
(x-5/2)²=31/4
x-5/2=±√31／2
x1=5/2+√31／2, x2=5/2-√31／2