document.write( "Question 1016919: Find f ’(x) if \r
\n" ); document.write( "\n" ); document.write( " f(x) = 3 x^3.9 - 6 x^-8.9 - 1\r
\n" ); document.write( "\n" ); document.write( "and evaluate f ’(1). (Keep 2 decimal places) \n" ); document.write( "
Algebra.Com's Answer #633431 by ikleyn(52879)\"\" \"About 
You can put this solution on YOUR website!
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\n" ); document.write( "Find f ’(x) if \r
\n" ); document.write( "\n" ); document.write( " f(x) = 3 x^3.9 - 6 x^-8.9 - 1\r
\n" ); document.write( "\n" ); document.write( "and evaluate f ’(1). (Keep 2 decimal places)
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document.write( "Hello,\r\n" );
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document.write( "I noticed that you submitted a number of requests similar to this one.\r\n" );
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document.write( "It looks like you are a student taking Calculus.\r\n" );
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document.write( "I will assume it in what follows.\r\n" );
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document.write( "Do you know what the derivative function is?\r\n" );
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document.write( "Do you know how to differentiate functions?\r\n" );
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document.write( "If not, look into your textbook and learn it from there.\r\n" );
document.write( "Is is very basic skills and knowledge for a Calculus student.\r\n" );
document.write( "Like adding and subtracting numbers for Elementary school students.\r\n" );
document.write( "If you want to study Calculus, you must do it.\r\n" );
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document.write( "I don't know what is your textbook.\r\n" );
document.write( "From my side, I'd recommend \r\n" );
document.write( "\"Calculus of a single variable\" by Larson and Edward, 5 edition, 2011,\r\n" );
document.write( "ISBN 978-0-538-7355-0\r\n" );
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document.write( "You can buy it via Amazon for low cost (my was $8 plus delivery, Used at very good condition).\r\n" );
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document.write( "When you need to solve problems like this, you may use and you should know the standard table \r\n" );
document.write( "of derivatives of basic functions.\r\n" );
document.write( "You may find such a table in the Internet. See, for example, these links\r\n" );
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document.write( "  http://tutorial.math.lamar.edu/pdf/Common_Derivatives_Integrals.pdf\r\n" );
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document.write( "  http://www.sosmath.com/tables/derivative/derivative.html\r\n" );
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\r
\n" ); document.write( "\n" ); document.write( "OK. Now to your problem.\r
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\n" ); document.write( "\n" ); document.write( "f'(x) = \"3%2A%283.9%29%2Ax%5E2.9\" - \"6%2A%28-8.9%29%2Ax%5E%28-9.9%29\".\r
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\n" ); document.write( "\n" ); document.write( "f'(1) = \"3%2A3.9%2A1%5E12.9\" + \"6%2A8.9%2A1%5E%28-9.9%29\" = 3*3.9 + 6*8.9.\r
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\n" ); document.write( "\n" ); document.write( "Please calculate it yourself.\r
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