Acity manager wants to add a playground in a new city park. the rectangle below represents the plan for the dimensions of the rectangular playground.
area = x^2 + 18x + 45; width=w; length= x+15
a. find the width (w) of the rectangle if the area of the rectangle is x2 + 18x + 45.
b. find the dimensions (length × width) and the area of the playground if x = 8 yards.