What is the square root of 90?

Answer 1

9.48683

Assuming you mean sqrt as in "square root" then sqrt(90)=

9.48683298050513799596806332982.

(that's as far as my calculator goes there's infinitely more digits)
The square root of 90 is: 9.4868329805051
The square root of 90 is 9.48683298, or 3√10 in simplest radical form.
It is an irrational number which can be simplified to 3 times the square root of 10

Answer 2

Negative number like -90 can't normally be squared rooted