How do you express the square root of 25?

The square root of a number is defined as the value that, when multiplied by itself, gives the original number. In this case, we are looking at the square root of 25. The number 5 fulfills this definition, as multiplying 5 by itself (5 × 5) equals 25. Therefore, the square root of 25 is indeed 5, which makes this choice the correct answer.

This concept is fundamental in mathematics and demonstrates the relationship between squaring and square roots. Each non-negative number has a non-negative square root, and for perfect squares like 25, this process is straightforward because there is an integer solution.