Polynomials, power functions, and rational function are all algebraic functions 1 Polynomials A function p is a polynomial if p(x) = anxn + an-1xn-
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Functions and different types of functions
A relation is a function if for every x in the domain there is exactly one y in the codomain. A vertical line through any element of the domain should intersect the graph of the function exactly once. (one to one or many to one but not all the Bs have to be busy) A function is injective if for every y in the codomain B there is at most one x in the domain. A horizontal line should intersect the graph of the function at most once (i.e.not at all or once). (one to one only but not all the Bs have to be busy) A function is bijective if for every y in the codomain there is exactly one x in the domain. A horizontal line through any element of the range should intersect the graph of the function exactly once. (one to one only and all the Bs must be busy). A function is surjective if for every y in the codomain B there is at least one x in the domain. A horizontal line intersects the graph of the function at least once (i.e.once or more).The range and the codomain are identical.
(one to one or many to one and all the Bs must be busy)Functions and different types of functions
Sample paper 1 LCHL 2012
322 2 5 3 5
3 10 3
Solve 0
3 10 3 0
3 1 3 0
1,331, 5.483
3, 4 y x x x dyxxdx dy dx xx xx xx xy xy (b) State whether f is injective. Give a reason for your answer. f is not injective as for every y in the codomain there can be more than one x in the domain as shown by the intersection of two of the horizontal red lines below with the graph. There are for example three values of x for which f(x) =5. 2 2 2 2 213 2 2 3