Question 9Let $w$ be the complex number $2 + i,$ where $i = \sqrt{-1}.$ What real number $r$ has the property that $r,$ $w,$ and $w^2$ are three collinear points in the complex plane?$\dfrac{3}{4}$$1$$\dfrac{7}{5}$$\dfrac{3}{2}$$\dfrac{5}{3}$