Looks OK to me, solve using the quadratic formula.
The width of a rectangle is 2 less than twice its length. If the area of the rectangle is 54 cm, what is the length of the diagonal?
Note: Your answer must be a number. It may not contain any arithmetic operations.
For this i have done:
A = lw
so
54= l ( 2l - 2)
54= (2l^2 - 2l)
54 = 2l ( l -1)
This seems wrong...