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Topic: Quadratics
Bablyonian use of square root of two
Photographs and analysis of an 1800 BC Babylonian table showing the diagonal of a square and ancient knowledge of the value of square root of two – expressed in base 60. A great extension resource. No previous knowledge of Babylonian required, but will make more sense if students know about different number base system. Full mathematical analysis on the site.
Completing the Square Game
Practise finding which term to add (and then subtract) when you are completing the square.
Graph of Standard Equation format of Parabola
A GeoGebra widget showing the standard equation of the parabola. Shows focus, vertex, directrix, axis of symmetry and equation.
Parabola Equation
This interactive graphs the parabolas of (x-h)²=4p(y-k) and 4p(x-h)=(y-k)². Use the sliders to adjust the values of h, k, and p and use the checkboxes to show or hide the graphs.
Wrecks Factor
From MangaHigh.com, factorise quadratic expressions to answer the ships’ distress calls and save their stricken crews!
The Wrecks Factor’s four increasingly challenging game modes cover a huge range of quadratics, from simple ones in the form of (x + 2)(x + 3) right up to tougher examples in the form of (2x + 3)(x + 1), including quadratics with common factors.