(√(a))²=a
The square root and the square cancel to leave just 49/21■
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The square root of A2 is... A !
Any square root squared is the number inside the ()
The square root of 81 squared is 81.
Just over 65 (65 squared = 4225)
Squared. E.g the square root of 4 is 2, and 2 squared is 4.