We started with some inequality problems and interval notation. The thing we focused on was square brackets vs curved brackets [ and (. One is inclusive, like a closed dot, and the other is exclusive like an open circle on a number line

When boundary points are found, three regions are divided. It’s good to pick convenient numbers in each region to test them.

We also looked at U notation (union) and the upside down version (intersection). Sometimes that is used. Same meanings as the words ‘or’ and ‘and’.

Domain refers to the horizontal (x-coordinates) a trick to remember that is DMX, if you know who DMX is.

Also plotted a few equations using points.

The sum of perfect cubes equation came into play again.

We looked at how the discriminant can determine whether a quadratic equation can be factored.

And u-substitution was used again.