Explanation:
Factor pairs that include a perfect square are:
- 3 × 40 (since 40 = 2^2 * 10)
- 30 × 4 (since 30 = 2 * 3 * 5, and 4 = 2^2)
- 5 × 24 (since 24 = 2^3 * 3)
- 8 × 15 (since 8 = 2^3)
- 120 × 1 (since 120 = 2^3 * 3 * 5)
So, the factor pairs that include a perfect square are: 3 × 40, 30 × 4, 5 × 24, 8 × 15, and 120 × 1.