Letszoom for a closer look.
One idea is to spread the two lines so that one has negative slope.
A traditionalapproach would begin with algebraic manipulation.
Now let's add the graph of the parabola and compare it with our sketch.
Letsfirst start with an easy function for f and then try to generate a g x which satisfies what we want.
Try The graphs are A zoom to the left shows and to the right shows The result seems on target.