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Sketch the following functions/relations and supply the domain and range....
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High School Teacher
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.
Posted by embizze on November 2, 2011 at 11:02 AM (Answer #1)
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