Graph `y=3x^2-42x+149` :
Use completing the square to write in vertex form:
`=3(x^2-14x+49)+149-147` we added 3(49), and subtracted 3(49)
This is a parabola with the vertex at (7,2).
With the base function of `y=x^2` you transformed the base function by translating 7 units right, 2 units up, and vertically stretching by a factor of 3.
The graph: horizontal translation blue, vertical translation green, vertical stretch (and final graph) red, base function in black:
The domain is all reals, the range is `y>=2` .