Learn the Secret to Solve THIS Without A Calculator!

The fastest way to solve this hard square root, without calculators or complicated calculations! Learn how the algebraic expansions of (a + b)² and (a - b)² help in solving this equation!

This question was inspired by the 2019 Singapore Mathematical Olympiad (SMO) competition, Junior Section Round 1, Question 14.

Credits:
End Music by Clavier Clavier from Pixabay "peace of mind - Calm Ambient Music"
60-second Timer by Channel "Green / Blue Screen" from video titled "60 Seconds Countdown Timer [FREE GREEN SCREEN FOOTAGE] [4K]"
   • 60 Seconds Countdown Timer [FREE GREEN SCR...  

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