Exam 2: Polynomial and Rational Functions

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Find the zeros of the function below algebraically, if any exist. f(x)=x69x3+8f ( x ) = x ^ { 6 } - 9 x ^ { 3 } + 8

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Describe the right-hand and the left-hand behavior of the graph of q(x)=7x5+x3+7q ( x ) = 7 x ^ { 5 } + x ^ { 3 } + 7 .

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Use long division to divide. (x3+3x2+x+3)÷(x+3)\left( x ^ { 3 } + 3 x ^ { 2 } + x + 3 \right) \div ( x + 3 )

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Simplify 2+5i3i\frac { 2 + 5 i } { 3 i } and write the answer in standard form.

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The graph of the function f(x)=3xx+1f ( x ) = \frac { 3 x } { x + 1 } is shown below. Determine the domain.  The graph of the function  f ( x ) = \frac { 3 x } { x + 1 }  is shown below. Determine the domain.

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Determine the domain of f(x)=6x+6x26xf ( x ) = \frac { 6 x + 6 } { x ^ { 2 } - 6 x } .

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Determine the zeros (if any) of the rational function f(x)=x29x2f ( x ) = \frac { x ^ { 2 } - 9 } { x - 2 } .

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Perform the following operation and write the result in standard form. 9i9+i+29i\frac { 9 i } { 9 + i } + \frac { 2 } { 9 - i }

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Determine the vertex of the graph of the quadratic function f(x)=x2+5x+294f ( x ) = x ^ { 2 } + 5 x + \frac { 29 } { 4 } .

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Use synthetic division to divide. (2x35x222x15)÷(x5)\left( 2 x ^ { 3 } - 5 x ^ { 2 } - 22 x - 15 \right) \div ( x - 5 )

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Find all the rational zeros of the function f(x)=2x49x341x2+225x225f ( x ) = 2 x ^ { 4 } - 9 x ^ { 3 } - 41 x ^ { 2 } + 225 x - 225 .

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A polynomial function ff has degree 3 , the zeros below, and a solution point of f(3)=4f ( - 3 ) = - 4 . Write ff in completely factored form. 4,3+2i- 4 , - 3 + 2 i

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Determine the vertex of the graph of the quadratic function f(x)=x2x+54f ( x ) = x ^ { 2 } - x + \frac { 5 } { 4 } .

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The interest rates that banks charge to borrow money fluctuate with the economy. The interest rate charged by a bank in a certain country is given in the table below. Let tt represent the year, with t=0t = 0 corresponding to 1986 . Use the regression feature of a graphing utility to find a quadratic model of the form y=at2+bt+cy = a t ^ { 2 } + b t + c for the data. Year Percent 1986 12.8 1988 10.0 1990 6.9 1992 5.7 1994 8.6 1996 12.7

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Use long division to divide. (x3+27)÷(x+3)\left( x ^ { 3 } + 27 \right) \div ( x + 3 )

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Use long division to divide. (x3+4x1)÷(x+2)\left( x ^ { 3 } + 4 x - 1 \right) \div ( x + 2 )

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Find two positive real numbers whose product is a maximum and whose sum is 116 .

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Which of the following is the graph of the given equation? f(x)=2xx+3f ( x ) = \frac { 2 - x } { x + 3 }

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Write f(x)=x311x2+18x+25f ( x ) = x ^ { 3 } - 11 x ^ { 2 } + 18 x + 25 in the form f(x)=(xk)q(x)+rf ( x ) = ( x - k ) q ( x ) + r when k=6+6k = 6 + \sqrt { 6 } .

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Find all zeros of the function f(x)=x2(x2)(x3216)f ( x ) = x ^ { 2 } ( x - 2 ) \left( x ^ { 3 } - 216 \right) .

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