- Download PDF
1 Answer | Add Yours
Sketch `y=x^2-x+1` . If it is a function, state the domain and range and determine if it is onto, one-to-one, or both.
(1) This is a function -- it is a parabola.
(2) The domain is all real numbers as all polynomials have this domain. The range is y>3/4. The parabola has a minimum value at its vertex (1/2,3/4).
(3) This function is neither injective (one-to-one) nor surjective (onto), and thus not bijective (both).
It is not one-to-one since the graph fails the horizontal line test. For example, if y=3 x=2 or -1.
It is not onto since the function never maps to a negative number.
We’ve answered 319,582 questions. We can answer yours, too.Ask a question