2x^2 - x - 8 i get to 4xdeltax + 2(deltax)^2 - deltax the 2(deltax)^2 part is confusing me I get the answer 4x but it's supposed to be 4x - 1 thanks for any help
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Expanding the top and we get: Note that many of the terms in the top cancel one another and we are left with: See what's left?. The derivative of
When you divide 4xdeltax + 2(deltax)^2 - deltax by deltax you get 4x +2deltax - 1 letting delta x -> 0 you get 4x -1
It's the -1 that I dont't get, am I to assume -deltax divided by deltax is -1
-2/2 = -1 -f/f = -1 -anything/anything = -1 -dx/ddx = -1
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