# Answer to Question #10294 in Calculus for Harjyot Singh

Question #10294
Sir, I&#039;m having a concept problem and would be glad if you can help me out. my problem is as follows - 1. l dx = x + c right? What does this actually mean? does it mean we are integrating a very small x over and over so we get the parent function? 2. l [v(0), v(t)] dv = v(t) - v(0) ,how? here v is basically a f(t) ,thus to integrate, doesn&#039;t it mean l[0,t] df(t) = f(t) - f(0)? 3. | dv = v, not v+ c, why? where v is velocity please It would help me a lot if you can clear my concept.
1. From the definition of the parent function: F is parent to f iff F&#039;=f. For any number c: F&#039;=(F+c)&#039;, so we can say that f have infinitely many parent functions which generaly expressed by F+c.Now (x+c)&#039;=1, so I(1dx)=x+c
2. Here f(t)=1. If we rewrite the integral I [v(0),v(t)] dv=I [0,t] v&#039;dt=v[0,t]=v(t)-v(0). See the respective formula in lections or
wherever.
3. Here we think of it as follows I dv=I a dt=v where a is an acceleration. We usually talk about some specfiic acceleration, which is a derivative of a
velocity of some defined physical object. So there is not infinitely many
velocities (v+c, c is any) but one, defined v.

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