Show method selection, derivation, conditions, units, verification, and interpretation.
U05 · L01
Name
Date
1
State the central method of Infinite-Interval Improper Integrals and list the conditions that must be checked.
Faculty solution: Use defining infinite bounds through limits. State the relevant hypotheses, domain or interval, units when applicable, and a verification plan.
2
Evaluate ∫₁^∞1/x² dx.
Faculty solution: lim_{b→∞}(1−1/b)=1.
3
Determine ∫₁^∞1/x dx.
Faculty solution: It diverges because ln b→∞.
4
A learner makes an error by treating truncation as exact or reporting an approximation without error evidence. Explain the first invalid step and repair the reasoning.
Faculty solution: The first invalid step is treating truncation as exact or reporting an approximation without error evidence. Return to the governing definition or theorem, restore the missing condition, and verify the corrected result.
5
Create a short application of Infinite-Interval Improper Integrals in tail probability, decay, numerical measurement, and inaccessible antiderivatives. Define variables and identify the quantity an integral, differential equation, sequence, or series would measure.
Faculty solution: A defensible response defines variables and units, states assumptions, builds the correct mathematical object, and interprets its value in tail probability, decay, numerical measurement, and inaccessible antiderivatives.
6
Describe two independent ways to verify a result from Infinite-Interval Improper Integrals.
Faculty solution: Use an exact structural check such as differentiation, substitution, partial sums, or theorem hypotheses; then compare with numerical, graphical, dimensional, or limiting evidence.