29) √(a²+8ab+16b²), a=3, b=1/3

1. Recognize the expression under the radical as a perfect square: √((a+4b)²).
2. Simplify: |a+4b|.
3. Substitute a=3 and b=1/3: |3 + 4(1/3)| = |3 + 4/3| = |13/3| = 13/3.