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9-33.
  1. Use the sum or difference of cubes and what you already know about factoring to factor the following expressions as completely as possible. Homework Help ✎

    1. x5 + 8x2y3

    2. 8y6 – 125x3

Refer to the Math Notes box in Lesson 8.3.4 for the patterns of sums and differences of cubes.

Notice that x2 is a common factor for both terms.
Factor it out. Then use the sum of cubes to factor it completely.
Recall that 8 = 23.

This is already in the form you need.
Use the difference of cubes to factor it.
What are the cubes?