6. √21−4=− 7. √54−3=− 8. √30−=− 9. √56+=− 10. √28+3=− 11. √36+5=− 12. √14−5= 13. √28−3=...

Question

6. √21−4=−

7. √54−3=−

8. √30−=−

9. √56+=−

10. √28+3=−

11. √36+5=−

12. √14−5=

13. √28−3=

14. √2−=

15. √12+=

16. √48+2=

17. √21+4=

18. √−8+6=

19. √18+7=

20. √−8+9=

21. √−35+12=

22. √−56+15=

Answer 1

6.21-4х=х^2
x^2+4x-21=0
D=16+84=100>0
x1=(-4-10)/2=-14/2=-7
x2=(-4+10)/2=6/2=3
7.54-3x=x^2
x^2+3x-54=0
D=9+216=225>0
x1=(-3-15)/2=-18/2=-9
x2=(-3+15)/2=12/2=6
8.30-x=x^2
x^2+x-30=0
D=1+120=121>0
x1=(-1-11)/2=-12/2=-6
x2=(-1+11)/2=10/2=5
9.56+x=x^2
x^2-x-56=0
D=1+224=225>0
x1=(1-15)/2=-14/2=-7
x2=(1+15)/2=16/2=8