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=
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=
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Answers & Comments
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