20 and -20
The two square roots of 400 are: 20 and -20.
The real square roots of 400 are 20 and -20. This is because when you square both of these numbers, you get 400. In general, every positive real number has two square roots: one positive and one negative.
20. * * * * * Sort of. ± 20 are the square roots (not rout!) of 400.
20
20 is one of the two square roots of 400.
-15 15
They are -20 and +20.
Nine :) * * * * * Sort of. ± 9 are the square roots (not rout!) of 400.
300
-20 20
All whole numbers between 1 and 400 (=20 square).
To find a number that, when squared, gives a result between 400 and 500, we can look for the square roots of these boundary numbers. The square root of 400 is 20, and the square root of 500 is approximately 22.36. Therefore, any number between 20 and about 22.36 will satisfy the condition, such as 21 or 21.5.