Integration Q Homework: Integrate 4 with No Respective Variable?

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In summary, the conversation discusses the proper way to read and write integrals, and clarifies that an integral cannot have only a constant function without a variable.
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studentxlol
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Homework Statement



If ∫4x dx is read as integrate 4 with respect to x, then what is there's no x so that ∫4 d?. Integrate 4 with respect to nothing?
 
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studentxlol,

∫4x dx is read, "the integral of 4x with respect to x."

Underhill
 
  • #3
studentxlol said:

Homework Statement



If ∫4x dx is read as integrate 4 with respect to x,
No, it isn't. It would be read as "integrate 4x with respect to x"

then what is there's no x so that ∫4 d?. Integrate 4 with respect to nothing?
[itex]\int 4 d[/itex] is an incorrect notation. You do not need an x in the function to be integrated (it can be a constant function) but you cannot have "d" in an integral without a variable: [itex]\int 4dx= 4x+ C[/itex], [itex]\int 4 dt= 4t+ C[/itex], etc.
 

1. How do I integrate 4 with no respective variable?

To integrate 4 with no respective variable, you can use the formula for indefinite integrals, which is ∫4 dx = 4x + C, where C is the constant of integration. This means that the integral of 4 with respect to any variable is equal to 4 multiplied by that variable, plus a constant.

2. Can I solve for the constant of integration if I have a specific value for the integral?

Yes, you can solve for the constant of integration by plugging in the given value for the integral into the formula and solving for C. For example, if the integral is equal to 10, then 10 = 4x + C, and you can solve for C by subtracting 4x from both sides.

3. Is it possible to integrate 4 with no respective variable in definite integrals?

Yes, it is possible to integrate 4 with no respective variable in definite integrals. In this case, you would need to use the limits of integration to determine the upper and lower bounds of the integral. The formula for definite integrals is ∫a to b 4 dx = 4x |b - 4x |a, where a and b are the limits of integration.

4. Can I use the power rule to integrate 4 with no respective variable?

No, the power rule only applies to functions with variables. Since 4 is a constant, it cannot be integrated using the power rule. You would need to use the formula for indefinite integrals or definite integrals, depending on the context of the problem.

5. Are there any other methods for integrating 4 with no respective variable?

Yes, there are other methods for integrating 4 with no respective variable, such as using the substitution method or integration by parts. However, the most straightforward and commonly used method is the formula for indefinite integrals mentioned in the first question.

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