Hello!
The number 49 is similar to other numbers like 25, 81, 4, or 64. All these numbers are perfect squares. Perfect squares are numbers multiplied by itself. Here is a list of commonly used perfect squares.
From the list above, the square root of 49 is 7, but the question asks for the negative square root of 49, which is written as: -√49.
To simplify this expression, first, simplify the radical, and then multiply the product by negative one.
7 × -1 = -7
Therefore, the negative square root of 49 is choice C, - 7.
