配方得:(x-2)2-12=0,
∴(x-2)2=12,
解得:x1=2+2
3 |
3 |
②(3x-1)2=4(2x+3)2,
化簡得:7x2+54x+35=0,
∴(x+7)(7x+5)=0,
解得:x1=-7,x2=?
5 |
7 |
③4x2-4x+1=x2+6x+9,
移項(xiàng)化簡得:3x2-10x-8=0,
∴(x-4)(3x+2)=0,
解得:x1=4,x2=-
2 |
3 |
④7x(x+5)+10=9x-9,
去括號(hào)、移項(xiàng)、化簡得:7x2+26x+19=0,
∴(x+1)(7x+19)=0,
解得:x1=-1,x2=?
19 |
7 |