Question

Question 5(Multiple Choice Worth 4 points)

Answer 1

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.

• 1 × 1 = 1
• 2 × 2 = 4
• 3 × 3 = 9
• 4 × 4 = 16
• 5 × 5 = 25
• 6 × 6 = 36
• 7 × 7 = 49
• 8 × 8 = 64
• 9 × 9 = 81
• 10 × 10 = 100
• 11 × 11 = 121
• 12 × 12 = 144

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.