Exam 2: Polynomial and Rational Functions

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Simplify 2+i5+2i\frac { 2 + i } { 5 + 2 i } and write the answer in standard form.

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Simplify 12i5i\frac { 1 - 2 i } { 5 i } and write the answer in standard form.

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Use long division to divide. (6x220x+6)÷(x3)\left( 6 x ^ { 2 } - 20 x + 6 \right) \div ( x - 3 )

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Suppose the IQ scores (y( y , rounded to the nearest 10)10 ) for a group of people are summarized in the table below. Use the regression feature of a graphing utility to find a quadratic function of the form y=ax2+bx+cy = a x ^ { 2 } + b x + c for the data. IQ Score Number of People 70 50 80 76 90 89 100 93 110 74 120 53 130 16

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Using the factors (x+4)( x + 4 ) and (x+3)( x + 3 ) , find the remaining factor(s) of f(x)=x3+6x2+5x12f ( x ) = x ^ { 3 } + 6 x ^ { 2 } + 5 x - 12 and write the polynomial in fully factored form.

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Determine the value that f(x)=3x5x6f ( x ) = \frac { 3 x - 5 } { x - 6 } approaches as x increases and decreases in magnitude without bound.

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Find a fifth degree polynomial function of the lowest degree that has the zeros below and whose leading coefficient is one. 4,1,0,1,4- 4 , - 1,0,1,4

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Simplify (36i)2(3+6i)2( 3 - 6 i ) ^ { 2 } - ( 3 + 6 i ) ^ { 2 } and write the answer in standard form.

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Write the standard form of the equation of the parabola that has a vertex at (23,19)\left( \frac { - 2 } { 3 } , \frac { 1 } { 9 } \right) and passes through the point (3,4)( 3 , - 4 ) .

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Find the quadratic function f whose graph intersects the x-axis at (1,0) and (4,0) and the y-axis at (0,4).

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Sketch the graph of the rational function below. f(x)=x21xf ( x ) = - \frac { x ^ { 2 } - 1 } { x }

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Determine the zeros (if any) of the rational function g(x)=7+2x2+7g ( x ) = 7 + \frac { 2 } { x ^ { 2 } + 7 } .

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Use the regression feature of a graphing utility to find a quadratic model for the data below. x y -2 15.7 -1 3.5 0 -2.7 1 -2.9 2 3.7 3 15.8 4 33.6

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Find the zeros of the function below algebraically, if any exist. f(x)=x6+28x3+27f ( x ) = x ^ { 6 } + 28 x ^ { 3 } + 27

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Determine the domain of the function f(x)=x2+7x+12x2+16f ( x ) = \frac { x ^ { 2 } + 7 x + 12 } { x ^ { 2 } + 16 } .

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Determine the vertex of the graph of the quadratic function f(x)=x2+2f ( x ) = x ^ { 2 } + 2 .

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Write the standard form of the equation of the parabola that has a vertex at (3,8)( 3,8 ) and passes through the point (5,2)( 5 , - 2 ) .

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Simplify (2)11( \sqrt { - 2 } ) ^ { 11 } and write the answer in standard form.

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Use the regression feature of a graphing utility to find a quadratic model for the data below. -2 9.8 -1 4.1 0 3.3 1 6.6 2 13.8 3 24.1 4 39.5

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Determine the xx -intercept(s) of the quadratic function f(x)=x2+6x+10f ( x ) = x ^ { 2 } + 6 x + 10 .

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