A History of the Grouping Method

Back in 2018 I was asked to write a couple of guest blog posts for La Salle. I wrote this post about factorising non-monics and another post about vulgar fractions. These posts no longer appear on La Salle's website so I'm re-posting them here. *************Factorising a quadratic when the coefficient of x2 doesn't equal one (a 'non-monic') is apparently one of the more challenging skills