Question

What is root of 81???​

Answer 1

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$\sqrt{81} = 9$

Check :-

${9}^{2} = 9 \times 9 = 81$

Answer 2

The square root of a number is the number that when multiplied to itself gives the original number as the product. Finding the square root of a number is the inverse of squaring a number. 

• 81 = a × a = a²

Thus,

• a = √81= √(9 × 9)9 × 9 = 81 or -9 × -9 = 81.

Therefore 

• √81= ± 9

This shows that 81 is a perfect square.

• Square Root of 81: √81 = 9

• Square of 81: 81² = 6,561