# Proof by Induction : Step-by-step

Let p(n) be the statement that:

1^3 + 2^3 + ... + n^3 = (n (n + 1) /2)^2 for the positive integer n.

a) What is the statement P(1)?

b) Show that P(1) is true, completing the basis step of the proof.

c) What is the inductive hypothesis?

d) What do you need to prove in the inductive step?

e) Complete the inductive step.

f) Explain why these steps show that this formula is true whenever n is a positive integer.

Show all work.

See attached file for full problem description.

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#### Solution Summary

A proof by induction is provided. The steps are shown.

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