Verified answer

1) х²-0,002809=0

х²=0,002809

х=0,053

х=-0,053

2) 3,286х²=0

х²=0

х=0

3) 2х²-48,096=0

2х²=48,096

х²=24,048

х=√24,048

х=-√24,048

4) (х-4)²-28,09=0

х²-8х+16-28,09=0

х²-8х-12,09=0

х=(8±√(64+48,36))/2=(8±10,6)/2

х=9,3

х=-1,3