# What’s new? January 2022

2019-20: Sep | Oct | Nov | Dec | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug

2020-21: Sep | Oct | Nov | Dec | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug

2021-22: Sep | Oct | Nov | Dec

#### GeoGebra applets

We have added new applets and made updates to existing applets. Here are a couple of examples:

##### Representing quadratic functions with dynamic algebra tiles

This applet has been added at here. In the left pane is a graph of $$y=\text{f}(x)$$. On the right, you can click to reveal various features and representations of the function, such as the factorised form (where possible), vertex form, line of symmetry, and more.

You can also move the blue point on the graph to see dynamically resizing algebra tiles, which may be help make things “click” for students, especially if you focus on:

• how the factorised tiles appear at the roots (where roots exist);
• how the “completed square” tiles appear at the turning point; and
• how each of the two representation appears at the -intercept.

You can generate new quadratic functions by clicking the New function button. When launched, the applet only generates monic quadratics with integer roots. By clicking the Options▼ dropdown, you can allow the applet to also generate non-monics, quadratics with irrational roots, and quadratics with no roots.

##### Compound vs simple interest

This applet R16a has been updated so that while focussing on simple or compound interest in isolation, you can now turn off the normal horizontal gridlines and instead highlight the constant or increasing amounts of interest respectively.

#### Vocabulary resources

We have continued to create slides highlighting the etymology of key words, creating cross-curricular links where possible. Here is an example of a recent addition: