SOLUTION: Sketch a graph of a function f that satisfies the following conditions: f does NOT have an inverse function f(x) > x for all x f(1) > 0

Algebra ->  Graphs -> SOLUTION: Sketch a graph of a function f that satisfies the following conditions: f does NOT have an inverse function f(x) > x for all x f(1) > 0      Log On


   



Question 1037247: Sketch a graph of a function f that satisfies the following conditions:
f does NOT have an inverse function
f(x) > x for all x
f(1) > 0

Answer by robertb(5830) About Me  (Show Source):
You can put this solution on YOUR website!
Let f%28x%29+=+x%5E2+-+x+%2B+3.
f has no inverse function since it fails the horizontal line test for one-to-one-ness.
f(x) > x since, for all real x, x%5E2-2x%2B3+%3E0, hence f%28x%29+=+x%5E2+-+x+%2B+3+%3E+x.
Finally f(1) = 3 > 0.
graph%28+300%2C+200%2C+-5%2C+5%2C+-5%2C+5%2C+x%5E2+-+x+%2B3%2C+x+%29.
(Notice that the parabola is entirely above the line y = x, which signifies f(x) > x for all x.)
There still many more functions that would satisfy the initial conditions.