Michael J. answered 04/20/15
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Effective High School STEM Tutor & CUNY Math Peer Leader
First, we take the integral of x2 - 3x + 1 with respect to x.
∫(x2 - 3x + 1)dx
The rule for integrating a term with an exponent is
∫Cxn dx = C∫[(xn + 1) / (nn+1)]
So
∫(x2 - 3x + 1)dx = ∫x2dx - 3∫xdx + ∫1dx
= (1/3)x3 + (3/2)x2 + x + C
The solution to this problem is
d/dt[ (1/3)x3 + (3/2)x2 + x + C]
We cannot take the derivative of this because the notation tells us to take the derivative with respect to t. The variable in the function here is x. Two different variables. This means that we are done here.