document.write( "Question 361657: find the derivative of the function f(x)=x^2+4, a=1 using F'(a)=(F(x)-F(a)) /( x-a) when x approaching a \n" ); document.write( "
Algebra.Com's Answer #257884 by Fombitz(32388)\"\" \"About 
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\n" ); document.write( "\"f%28x%29-f%28a%29=x%5E2%2B4-%28a%5E2%2B4%29\"
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\n" ); document.write( "\"%28f%28x%29-f%28x%29%29%2F%28x-a%29=%28%28x-a%29%28x%2Ba%29%29%2F%28x-a%29\"
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