變形得:x2=5,
解得:x1=
5 |
5 |
(2)x2+4x-6=0,
移項得:x2+4x=6,
配方得:x2+4x+4=10,即(x+2)2=10,
開方得:x+2=±
10 |
則x1=-2+
10 |
10 |
(3)2x2-7x+3=0,
分解因式得:(2x-1)(x-3)=0,
可得2x-1=0或x-3=0,
解得:x1=
1 |
2 |
(4)(x+2)2-10(x+2)+24=0,
分解因式得:(x+2-4)(x+2-6)=0,
可得x+2-4=0或x+2-6=0,
解得:x1=2,x2=4.
5 |
5 |
10 |
10 |
10 |
1 |
2 |