Resolver as equações do 2° grau, sendo U=R.
1. x(x+5)-2x = 29
2. (x+1)(x-2)=3
3. (x-1)(x+5)=7
4. (2x-1)2=3x2-x+7
5. (x-1)2 +8(x+1)=0
6. (2x-1)2-(x+2)2=-2x