The function f is defined by a polynomial. Some values of x and are shown in the table. What is the value of ?

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The function <em> f</em> is defined by a polynomial. Some values of <em> x</em> and <img alt='images' src='https://www.fatskills.com/images2/SAT/eq03101.png'/><!--<m:math display='inline' overflow='scroll' xmlns:m='http://www.w3.org/1998/Math/MathML'><m:mrow><m:mi>f</m:mi><m:mfenced open='(' close=')'><m:mrow><m:mi>x</m:mi></m:mrow></m:mfenced></m:mrow></m:math>--> are shown in the table. What is the value of <img alt='images' src='https://www.fatskills.com/images2/SAT/eq03102.png'/><!--<m:math display='inline' overflow='scroll' xmlns:m='http://www.w3.org/1998/Math/MathML'><m:mrow><m:mfrac><m:mrow><m:mn>2</m:mn><m:mi>f</m:mi><m:mfenced open='(' close=')'><m:mrow><m:mn>3</m:mn></m:mrow></m:mfenced></m:mrow><m:mn>5</m:mn></m:mfrac></m:mrow></m:math>-->?