Algebra: Chapter 13-2, p 580
More Solving Quadratic Equations
Solve a quadratic equation of the form `ax^2 = k`
Example: `-3x^2 + 7 = 0` becomes …
`-3x^2 = -7` or `x^2=7/3`
then `x = ±sqrt(7/3)`, don’t forget to rationalize this to `x = ±sqrt(21)/3`!
Solve a quadratic equation by factoring one expression into a binomial square [of the form `(x + a)^2 = k`]
Example: `(x-5)^2 = 9`, if you take the square root of both sides becomes …
`x-5 = ±sqrt(9)` or `x = 5 ±sqrt(9)` or `x = 5 ± 3` or `x=8` or `x=2`
Math-8: Chapter 12-3, p 623
Geometric Probability
Just like we did in Chapter 9 with simple probability, we can do the same thing with geometric probability. With geometric probability, we are usually talking about circle, bulls-eyes, squares or other geometric figures. Remember, the formualae for the area of a rectangle `A=l⋅w` and the area of a circle `A=πr^2` can come in handy!