If $\sqrt{x + 9} = 5$, then $x$ equals

If $\sqrt{x + 9} = 5$, then $x$ equals
  1. $16$
  2. $25$
  3. $4$
  4. $14$

Solution

Square both sides: $x + 9 = 25 \Rightarrow x = 16$.

Asked in: IMO

Practice more SQUARES AND SQUARE ROOTS questions on Aicharya