document.write( "Question 49278: Give f(x)=5x^2-3x+1, find f(-2). \n" ); document.write( "

Algebra.Com's Answer #32676 by AnlytcPhil(1810) $\"\"$ $\"About$

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Give f(x)=5x^2-3x+1, find f(-2).\r\n" );
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document.write( " f(x) = 5x² - 3x + 1\r\n" );
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document.write( "Replace all the x's on both sides with empty \r\n" );
document.write( "parentheses:\r\n" );
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document.write( "f(  ) = 5(  )² - 3(  ) + 1\r\n" );
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document.write( "Now fill in all the empty parentheses with -2\r\n" );
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document.write( "f(-2) = 5(-2)² - 3(-2) + 1\r\n" );
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document.write( "Leave the left side as it is but simplify the\r\n" );
document.write( "right side:\r\n" );
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document.write( "f(-2) = 5(-2)² - 3(-2) + 1\r\n" );
document.write( "f(-2) = 5(4) + 6 + 1\r\n" );
document.write( "f(-2) = 20 + 7\r\n" );
document.write( "f(-2) = 27\r\n" );
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document.write( "So you see, functional notation merely amounts\r\n" );
document.write( "to \"plugging in\" for x what's in the parentheses\r\n" );
document.write( "after the \"f\".\r\n" );
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document.write( "Edwin

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