Question

what is the square root of 81

Answer 1

Hey dude......

√81=9

Hope this will help you.....

Answer 2

Step-by-step explanation:

81=9⋅9 then the square root of √81=9.

Because the double multiplication for the same sign is always positive, the square root is also valid with the other sign 81=(−9)⋅(−9) then √81=−9 and we can say that √81=±9.

What if we do not know the value? There is an algorithm to calculate the square root quite simple (the Babylonian algorithm).

We want to calculate the square root of 81, we first guess a possible value. For example we know that 10⋅10=100 and 7⋅7=49, then we can imagine that the square root of 81 is between 7 and 10, we can imagine for example 8.3.