A=lw
3x²+4x-4​=6(3x-2)
3x²+4x-4 ​= 18w-12 add 12 to both sides
3x²+4x+8 = 18x subtract 18 from both sides
3x²-14x+8=0 factor
(3x-2) and (x-4) solve for x
3x-2 = 0 x-4=0
3x=2 x=4
x=2/3
x

Substitute each value for x to find the length
x=2/3
3(2/3)-2 = -1.
In this case, it cannot have a negative value for the length of the rectangle.

x=4
3(4)-2) = 10

The correct answer is D. 10 ft. This is the length of the rectangle