How to write quadratic functions from 3 forms.

1. Writing Quadratic
Functions
Algebraic Reasoning

3. Use Vertex form when:
Given the vertex and a point.
1. Substitute values
2. Solve for a
3. Replace vertex and a in vertex form and convert to
standard form

4. Now Practice:

5. Use Intercept form when:
Given the zeros (x-intercepts) and a point.
1. Substitute values
2. Solve for a
3. Replace intercepts and a in intercept form and
convert to standard form

6. Now Practice:

7. Use System of Equations when:
Given the 3 points (graph or table)
1. Substitute values
2. Solve for each variable using systems
3. Replace a, b, and c in standard form

8. Use System of Equations when:
Given the 3 points (graph or table)
1. Substitute values
2. Solve for each variable using systems
3. Replace a, b, and c in standard form

9. Now Practice: