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Let's evaluate each classmate's expression by substituting \( x = 3 \).
1. **Whitney's expression**: \( 4x - 8 \)
\[
4(3) - 8 = 12 - 8 = 4
\]
2. **Theo's expression**: \( 4x^2 - 8 \)
\[
4(3^2) - 8 = 4(9) - 8 = 36 - 8 = 28
\]
3. **Erin's expression**: \( 4x - 8 \) (which is the same as Whitney's)
\[
4(3) - 8 = 12 - 8 = 4
\]
Now, summarizing their results:
- Whitney: 4
- Theo: 28
- Erin: 4
Among the results, **Theo produced the largest value**, which is 28.