A rectangular garden has an area of 90m2. The width of the garden is 3 metres less than half of its length.
(i) Form a quadratic equation in the length l (in metres).
(ii) Solve the quadratic equation obtained in part (i) and give the possible value(s) of l correct to one decimal place.
(iii) Find the corresponding width of the garden.
(iv) Verify that your dimensions give the required area.