Find all the real square roots of 400.

Answer 1

The square root of 400 is a number that, when multiplied by itself, gives 400. We know that 20 × 20 = 400, so the square root of 400 is 20.

Since both positive and negative numbers can square to give us a positive result, the negative square root of 400 is also -20.

Therefore, the real square roots of 400 are 20 and -20.