Substitution Practice | Foundations for Calculus Part 2

Let's practise substituting −2 and zero into p(x) = 3x² − 2x + 1, keeping the complete input together and checking each contribution. We'll see how missing parentheses change the answer, then use C(q) = 4q + 7 to calculate rental charges, explain why the starting fee is added once, and decide which item counts make sense. You'll have opportunities to try the problems before checking the working. Prerequisites: Basic arithmetic with positive and negative numbers. Chapters 00:00 Reading the formula and choosing the input 00:56 Your turn: substitute −2 01:26 Evaluate and check p(−2) 03:02 Parentheses and sign mistakes 03:53 Substituting zero and keeping the constant 05:02 Rental charges: C(q) = 4q + 7 06:29 Why grouping changes the cost 07:13 Four items and allowed inputs 08:34 Recap: a method you can explain and check Additional materials: https://getinfinityinsights.com/