Approximate using perfect squares what is the radical symbol 78

The correct answer is:

The estimate is between 8 and 9.

Explanation:

Perfect squares are numbers whose square roots are whole numbers. 78 is not one; however, it is between two others, namely 64 and 81.

64 is the perfect square of 8, since 8 (8) = 64.

81 is the perfect square of 9, since 9 (9) = 81.

78 is between these two; since it is closer to 81, this means the answer will be a decimal between 8 and 9, but that is closer to 9.