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1640

Centuries: 16th century - 17th century - 18th century

Decades: 1590s 1600s 1610s 1620s 1630s - 1640s - 1650s 1660s 1670s 1680s 1690s

Years: 1635 1636 1637 1638 1639 - 1640 - 1641 1642 1643 1644 1645


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Quadratic formula

... 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. (Geometrically, this ...

 
 
 
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