Redirected from 820 BC
Decades: 870s BC 860s BC 850s BC 840s BC 830s BC - 820s BC - 810s BC 800s BC 790s BC 780s BC 770s BC
Significant People
... by the quadratic equation touches the x-axis in a single point.) If the discriminant is positive, then there are two different solutions x, both of which are real. ...