Use the binomial theorem (𝑥 + 𝑦)𝑛 = 𝑥𝑛 + (𝑛 1)𝑥𝑛−1𝑦+... + (𝑛 𝑟)𝑥𝑛−𝑟𝑦𝑟+... + 𝑦𝑛 to expand expressions, e.g.(2𝑥 − 1)3

mm-u1-t2-s1-d3

Request an applet

Describe what students should see or notice. That's the cue to build — requests are what get built next.