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By R. Fenn

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The only way to find the exact solutions is to factor the expression (using either long division or synthetic division). Here, we have √ √ f (x) = x 3 − x 2 − 2x + 2 = (x − 1)(x 2 − 2) = (x − 1)(x − 2)(x + 2), √ √ from which you can see that the zeros are x = 1, x = 2 and x = − 2. 02 x Recall that to find the points of intersection of two curves defined by y = f (x) and y = g(x), we set f (x) = g(x) to find the x-coordinates of any points of intersection. 4 Finding the Zeros of a Cubic Polynomial Finding the Intersections of a Line and a Parabola Find the points of intersection of the parabola y = x 2 − x − 5 and the line y = x + 3.

2, intersect only once. 4. The functions that you are probably most familiar with are polynomials. These are the simplest functions to work with because they are defined entirely in terms of arithmetic. 22b Curve passes vertical line test x where a0 , a1 , a2 , . . , an are real numbers (the coefficients of the polynomial) with an = 0 and n ≥ 0 is an integer (the degree of the polynomial). Note that the domain of every polynomial function is the entire real line. Further, recognize that the graph of the linear (degree 1) polynomial f (x) = ax + b is a straight line.

An are real numbers (the coefficients of the polynomial) with an = 0 and n ≥ 0 is an integer (the degree of the polynomial). Note that the domain of every polynomial function is the entire real line. Further, recognize that the graph of the linear (degree 1) polynomial f (x) = ax + b is a straight line. cls .. CHAPTER 0 T1: OSO October 11, 2006 10:47 Preliminaries 0-16 and f (x) = 2x 5 + 6x 4 − 8x 2 + x − 3 (polynomial of degree 5 or quintic polynomial). 23f. 4 Any function that can be written in the form f (x) = p(x) , q(x) where p and q are polynomials, is called a rational function.

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