Curriculum placement
Algebra 1. This describes the skill, not a learner estimate.
Values a rational expression excludes
Find inputs excluded by a rational expression’s denominator
Problem types
- Find excluded inputs
Builds on
- Domain and range
- Linear equations with variables on both sides
- Zeros and factors of a polynomial · Useful idea
The zeros of the denominator polynomial are the values excluded from the domain of a rational expression.
Leads to
Related skills
- Logarithms as inverses of exponentials · Related idea
A rational expression excludes zeros of the denominator and a logarithm excludes nonpositive inputs, both domain restrictions read from the expression.
- Why each equation step is valid · Shared foundations
- Rearranging a formula · Shared foundations
- Composition of functions · Shared foundations
- A graph as the solution set · Shared foundations
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