document.write( "Question 295655: find f(a + h) -f (a) for the following: f(x) = 4x + 5 \n" ); document.write( "
Algebra.Com's Answer #213131 by jim_thompson5910(35256)\"\" \"About 
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First compute f(a+h) and f(a). So \"f%28a%2Bh%29=4%28a%2Bh%29%2B5=4a%2B4h%2B5\" and \"f%28a%29=4a%2B5\"\r
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\n" ); document.write( "\n" ); document.write( "This means that \"f%28a%2Bh%29-f%28a%29=%284a%2B4h%2B5%29-%284a%2B5%29=4a%2B4h%2B5-4a-5=4h\"
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