Answer & step-by-step explanation:
Look at the equation: you can rewrite it as
Now the first term of the sum is at worst 0 (when
) so the sum is no less than 1.
Correct answer is the last option. Graph is the one in the photo, the thin red line is the axis - equation
, vertex has coordinate
, Y intersect is
and has no x intercepts. extra points as needed if you want a more accurate graph, mine is sketched on paint so don't expect great quality