Equacions de 2n grau completes
| __ | 1. | (2x+1)2= 2x2+x-1 | | A. | x1=4 i x2=1 | | __ | 2. | (3x-9)(x+5)=0 | | B. | x1=-2 i x2=3/2 | | __ | 3. | (x+1)2+4=0 | | C. | x1=3 i x2=-5 | | __ | 4. | (x+2)(2x-3)=0 | | D. | x1=3 i x2=2 | | __ | 5. | (x+2)2=3x+10 | | E. | No hi ha cap solució, discriminant -16 | | __ | 6. | (x+4)2 +x+4 =0 | | F. | x1=-5 i x2=-4 | | __ | 7. | (x-2)2=x | | G. | No hi ha cap solució, discriminant -7 | | __ | 8. | (x-3)(x+3)= 6x-18 | | H. | x1=-3 i x2=2 | | __ | 9. | (x-3)2=3-x | | I. | No hi ha cap solució, discriminant -11 | | __ | 10. | 3x2=-5x-3 | | J. | x=3 doble |
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