Added as complement to last post.

# Tag: quadratic equation

This 7th century visualisation of quadratic algebra, thanks to Islamic scholars, is a great place to start the academic year in mathematics.

Formula and completing the square – basic stuff for School maths students expressed loud and clear in Carr’s Synopsis of Elementary Results in 1880 – find a proof of 45 by using ideas in 47 and teach yourself to be a mathematical genius.