HELP!!!Sarah wants to hang a mirror in her room. The mirror and frame must have an area of 15 square feet. The mirror is 3 feet wide and 4 feet long. Which quadratic equation can be used to determine the thickness of the frame, x? 3x2 + 14x − 2 = 0 4x2 + 14x − 3 = 0 x2 + 12x − 14 = 0 2x2 + 7x − 14 = 0
Accepted Solution
A:
length of the outer frame: 4+2x width of the outer frame: 3+2x area of the outframe: (4+2x)(3+2x)=15 expand the equation: 12+8x+6x+12x^2=15 combine like terms: 4x^2+14x-3=0