Determine the derivative f ( x ) = 2 x2 -16x + 35, Mathematics

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Determine the derivative of the following function by using the definition of the derivative.

f ( x ) = 2 x2 -16x + 35

Solution

Thus, all we actually have to do is to plug this function into the definition of derivative, (1), and do some algebra. Whereas, admittedly, the algebra will get rather unpleasant at times, but it's just algebra hence don't get excited regarding the fact that now we're computing derivatives.

Firstly  plug the function in the definition of the derivative.

2416_derivation4.png

Be careful & ensure that you properly deal with parenthesis while doing the subtracting. Multiplying everything and distributing the minus sign through on the second term.  Doing this we obtain,

65_derivation5.png

Notice as well that every term into the numerator which didn't have an h in it canceled out and now we can factor an h out of the numerator that will cancel out against the h in the denominator.  After that we can calculate the limit.

476_derivation6.png                       = 4x-16

hence, the derivative is,

f ′ ( x ) = 4x -16


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