Katie wants to hang a painting in a gallery. The painting and frame must have an area of 45 square feet. The painting is 6 feet wide by 7 feet long. Which quadratic equation can be used to determine the thickness of the frame, x?
Each side should increase by 2x (left & right, and up & down) so that to match the condition : 7+2x)(6+2x) = 45 Solving it will give you: 4x² + 26x - 3
