# Category Archives: Algebra

## How to Graphically Interpret the Complex Roots of a Quadratic Equation

Very good stuff here. Nice mathematics, nice symmetry, nice visually! Nice paper with an explanation of what is going on by Carmen Melliger here. Good mathematics! Nice graphic by Shana McKay from Scaffolded Math. See also.

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## Roots of Unity

on GeoGebra https://www.geogebra.org/m/sZFwAZfs

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## The CCSSM, and now the new SAT, have Moved the Needle

Introduction Two days ago I was at an excellent presentation on the new SAT test. It was at the WIU Mini Conference on Secondary Mathematics Teaching. For the second time in 3 years, I experienced, in one 40-minute presentation, a … Continue reading

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## Free Worksheets site – Kuta

https://www.kutasoftware.com/freeipa.html

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## Memoranda Mathematica: A Synopsis of Facts, Formulae, and Methods (1912 book)

At this the MathFest (Washington DC 2015) lecture by Richard Guy and John Conway I learned of a book from 1912. Probably only of interest to math geeks. (yep math geek alert) I find it interesting that this reference book … Continue reading

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## Great Reference Sheets (Math)

EEWeb has a very good Math Help page with numerous Quick Reference Sheets Algebra – Properties Geometry – Shapes and Solids Trigonometry – Definition (has unit circle) Trigonometry – Laws and Identities Calculus – Derivatives and Limits Calculus – Integrals … Continue reading

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## Spotting Numbers and Visual Patterns

Here a two great websites that provide lots of great pattern problems. Spotting Numbers Visual Patterns These patterns can be used with elementary students (if you just ask number questions) through advanced algebra (if you include questions about functions). Mathematics … Continue reading

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