Question

Mary wants to hang a mirror in her room. The mirror and frame must have an area of 7 square feet. The mirror is 2 feet wide and 3 feet long. Which quadratic equation can be used to determine the thickness of the frame, x?

x2 + 14x − 2 = 0
2x2 + 10x − 7 = 0
3x2 + 12x − 7 = 0
4x2 + 10x − 1 = 0

Answer 1

Your answer should be D :)

Explanation:

I got it correct on my test.

Answer 2

4x² + 10x - 1 = 0

Explanation:

Width: 3 + 2x

Height: 2 + 2x

Area: (3 + 2x)(2 + 2x) = 7

4x² + 4x + 6x + 6 = 7

4x² + 10x - 1 = 0