Mathematics — first biennium · Lesson
Substitution means replacing every occurrence of the variable with the assigned value; with negative values parentheses protect the sign.
In this lesson: Substitute values for variables and correctly evaluate an expression.
How to proceed: Replace the letter everywhere it appears. If the value is negative, put it in parentheses before applying powers or products.
You can already assume: Algebraic expressions and rational numbers.
Completed exercises: 0/5 · Correct on first attempt: 0
Replace the letter everywhere it appears. If the value is negative, put it in parentheses before applying powers or products.
ConceptStep separates what is required from what is recommended or useful as reinforcement. Only required prerequisites block your progress.
Relationships: solid line = required · dashed line = recommended · dotted line = reinforcement.