A rectangular playground has its length greater than its width by 9m. The area of the playground is 136m2.
(i) Form an algebraic equation in one variable for the width of the playground.
(ii) Show that this equation is quadratic in nature and write it in the standard form ax2+bx+c=0.
(iii) Explain, without solving the equation, whether it can have two positive solutions for the width. Give a reason for your answer.