document.write( "Question 30352: Question: \r
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document.write( "Use the synthetic division to find f(-4) if f(x) =x^4+20x^3+396+405.\r
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document.write( "Possible Answers:
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document.write( "(a) none of these
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document.write( "(b) 6
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document.write( "(c) 7
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document.write( "(d) 5 \n" );
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Algebra.Com's Answer #17258 by sdmmadam@yahoo.com(530)![]() ![]() ![]() You can put this solution on YOUR website! Use the synthetic division to find f(-4) if f(x) =x^4+20x^3+396+405.\r \n" ); document.write( "\n" ); document.write( "---- 1 20 138 396 405 \n" ); document.write( "(-4)| -4 -64 -296 -400 \n" ); document.write( " ------------------------------------- \n" ); document.write( "-----1 16 74 100 5\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "We observe that the remainder is 5 and therefore \n" ); document.write( "Answer: f(-4) = 5 \n" ); document.write( "which is your choice (d) 5\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "Note: Leave out the x's and write down the numbers (called coefficients) of the first polynomial on the first line. Then put (-4) (which comes from [x-(-4)] on the second line. \n" ); document.write( "Start by copying the first 1 onto the bottom line. Multiply by (-4) to get the (-4) and write in the second line underneath 20. Add the top 20 to this (-4) to get 16. Keep repeating this by multiplying each number on the bottom line by \n" ); document.write( "(-4), and add the result to the top line, with the result of the addition going on the bottom line. \n" ); document.write( "The last number is the remainder\r \n" ); document.write( "\n" ); document.write( "Note: How is f(-4) = 5 \n" ); document.write( "the remainder got on division of f(x) by [x-(-4)] ? \n" ); document.write( "Answer:: It is the Remainder theorm: If a polynomial f(x) \n" ); document.write( "of degree n >1 is divided by the linear function (x-r), \n" ); document.write( "the remainder is the number f(r) \n" ); document.write( " |