Algebra: Chapter 13, Lesson 2, page 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`