Verified answer

²⁸√a⁷ = a⁷/²⁸ = a¹/⁴ = ⁴√a

⁵√(b³⁴√b³) = ⁵√(b³ b³/⁴) = ⁵√b³⁺³/⁴ = ⁵√b¹⁵/⁴ = b³/⁴ = ⁴√b³

⁶√m⁶ = |m| = {m ≤ 0} = -m

¹⁰√(x - 2)¹⁰ = |x - 2| = {x ≥ 2} = x - 2