Quadratic Root Factoring
저자: Barry Longden
1. Quadratic Equation
1.1. Always works
1.1.1. Benefit over other methods
1.2. Tedious calcuations
1.2.1. Drawback from other methods
1.3. Derived from the standard form of a quadratic
2. Always 2 answers
2.1. 2 distinct, real answers
2.2. 1 repeated, real answer
2.3. 2 distinct, complex (imaginary) answers
2.3.1. Always conjugates (+ or - between the real and imaginary parts)
3. Factor by Grouping
3.1. Reverse distribution
3.1.1. Find a common group (x + h) and find two groups that share this group
4. Factor by Reverse FOIL
4.1. Typical and quickest method
4.1.1. Diamond Method
4.1.2. Box Method
4.1.3. (x + h)(x + k) Method
5. Factor by Completing the Square
5.1. Another useful tool
5.1.1. Find a perfect square
5.1.1.1. Divide the b term by 2 and square it
5.1.1.2. Add this term to both sides of the equation
5.1.1.3. Solve for x