Find primitives of function (1+4x)/sqrt(1 + x + 2x^2)

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SUMMARY

The discussion centers on finding the primitives, or antiderivatives, of the function (1+4x)/sqrt(1+x+2x^2). Participants confirm that a primitive is indeed the antiderivative, leading to the integral expression ∫(1+4x)/√(1+x+2x²) dx. The substitution u = 1+x+2x² simplifies the integral to ∫u^(-1/2) du, with the final result requiring the addition of the integration constant C.

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This is a practice exam question that I have been given!
Find the primitives of the functions
(1+4x)/(sqrt(1+x+2x^2))

My question is 1. is a primitive the antiderivative? I don't remember my lecturer using primitive during our course!
 
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It is basically asking you to find:

[tex]\int \frac{1+4x}{\sqrt{1+x+2x^{2}}} \; dx[/tex]

A primitive is an antiderivative.

So set [tex]u = 1+x+2x^{2}[/tex]

Then [tex]du = 4x+1 \; dx[/tex] and you end up with [tex]\int u^{-\frac{1}{2}} \; du[/tex]. All the primitives mean that you add the integration constant [tex]C[/tex].
 
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ahhh thanks!
 

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