Question

1. 2х2-18=0
2. 3х2-12х=0
3. 2,7х2=0
4. х2+16=0
5. х2-=0
6. х2=-7х
7. х2-3х-5=11-3х
8. (х+1)2 + (х-6)2 = 2х2
9. x2-(2х - 3)(1+x)=3