Khan Academy
Khan Academy: Quadratics by Taking Square Roots
Solve quadratic equations of the form (x+a)squared-b=0. These can be solved using square roots. For example, solve (x-5)squared-4=0. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video...
Khan Academy
Khan Academy: Simplify Roots of Negative Numbers
Rewrite square roots of negative numbers as imaginary numbers.
Wolfram Research
Wolfram Math World: Square Root
This math site from Mathworld.com explains what a square root is including information on imaginary numbers and many links. This site also addresses the continued fractions of positive real square roots, in particular the square root of...
Mr. Martini's Classroom
Mr. Martini's Classroom: Square Roots
Practice solving square roots by changing the difficulty and assessing knowledge with a quiz.
Other
Dan's Math: Basic Skills Topics
College professor Dan Bach offers a review of various basic topics in arithmetic, pre-algebra, and algebra. Order of operations, exponents, square roots, variables, and combining terms are just a few of the many topics covered.
Math Open Reference
Math Open Reference: Root (Of a Number)
Learn how to find the root of a number. Topics covered include two roots, roots of negative numbers, and imaginary numbers. This site offers descriptions along with multiple examples.
Doina Popovici
Math Play: Powers Concentration Game
A concentration game that allows students to show off their knowledge of powers and square roots.
Lawrence Hall of Science
The Math Page: Skill in Algebra: Quadratic Equations
Here is a site that clearly and thoroughly explains the quadratic equations, including how to solve them by factoring, completing the square, and using the quadratic formula. There are example problems solved, problems for the student to...
Cuemath
Cuemath: Complex Numbers
A comprehensive guide for learning all about complex numbers with definitions, operations on complex numbers, solved examples, and practice questions.
Saddleback College
Algebra2 Go: Prealgebra
The resource consists of comprehensive learning tools such as class notes, video lectures, and templates through which students can review prealgebra topics.
University of Houston
University of Houston: Engines of Our Ingenuity: Hero(n) of Alexandria
Describes the life of Hero of Alexandria and discusses Hero's contribution to the development of the steam engine. Text is the actual radio transcript of a syndicated radio broadcast on invention and ingenuity.