Four Fours/30/Solutions/2

Puzzle: Four Fours: $30$

Using exactly $4$ instances of the number $4$, the task is to write an expression for $30$, using whatever arithmetical operations you consider necessary.

Solution

$30 = 4 \times 4 \times \sqrt 4 - \sqrt 4$

Sources

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