Four Fours/92/Solutions/2

Puzzle: Four Fours: $92$

Using exactly $4$ instances of the number $4$, the task is to write an expression for $92$, using whatever arithmetical operations you consider necessary.

Solution

$92 = \sqrt 4 \times \paren {4! \times \sqrt 4 - \sqrt 4}$

Sources

• 1980: Angela Dunn: Mathematical Bafflers (revised ed.) ... (previous) ... (next): $1$. Say it with Letters: Algebraic Amusements: Four Fours