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.