In the second problem, where did you get k=1? There is no k in the equation, k=0 there, unless you mistyped the equation. And yes, you will need the distributive property. 24(x+5.5)^2 = 24(x+5.5)(x+5.5) = 24(x^2 + 11x + 30.25). Then plug in x=0 for the y-intercept, and y=0 for the x-intercept. According to the original formula, the min value is (-5.5,0). Then just plot the graph with those values and you should be fine.