Integral of 2(xlnx-x)+2 dx
The solution
Detail solution
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Integrate term-by-term:
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The integral of a constant times a function is the constant times the integral of the function:
∫2(xlog(x)−x)dx=2∫(xlog(x)−x)dx
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Integrate term-by-term:
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There are multiple ways to do this integral.
Method #1
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Let u=log(x).
Then let du=xdx and substitute du:
∫ue2udu
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Use integration by parts:
∫udv=uv−∫vdu
Let u(u)=u and let dv(u)=e2u.
Then du(u)=1.
To find v(u):
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Let u=2u.
Then let du=2du and substitute 2du:
∫2eudu
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The integral of a constant times a function is the constant times the integral of the function:
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The integral of the exponential function is itself.
∫eudu=eu
So, the result is: 2eu
Now substitute u back in:
2e2u
Now evaluate the sub-integral.
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The integral of a constant times a function is the constant times the integral of the function:
∫2e2udu=2∫e2udu
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Let u=2u.
Then let du=2du and substitute 2du:
∫2eudu
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The integral of a constant times a function is the constant times the integral of the function:
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The integral of the exponential function is itself.
∫eudu=eu
So, the result is: 2eu
Now substitute u back in:
2e2u
So, the result is: 4e2u
Now substitute u back in:
2x2log(x)−4x2
Method #2
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Use integration by parts:
∫udv=uv−∫vdu
Let u(x)=log(x) and let dv(x)=x.
Then du(x)=x1.
To find v(x):
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The integral of xn is n+1xn+1 when n=−1:
∫xdx=2x2
Now evaluate the sub-integral.
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The integral of a constant times a function is the constant times the integral of the function:
∫2xdx=2∫xdx
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The integral of xn is n+1xn+1 when n=−1:
∫xdx=2x2
So, the result is: 4x2
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The integral of a constant times a function is the constant times the integral of the function:
∫(−x)dx=−∫xdx
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The integral of xn is n+1xn+1 when n=−1:
∫xdx=2x2
So, the result is: −2x2
The result is: 2x2log(x)−43x2
So, the result is: x2log(x)−23x2
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The integral of a constant is the constant times the variable of integration:
∫2dx=2x
The result is: x2log(x)−23x2+2x
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Now simplify:
2x(2xlog(x)−3x+4)
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Add the constant of integration:
2x(2xlog(x)−3x+4)+constant
The answer is:
2x(2xlog(x)−3x+4)+constant
The answer (Indefinite)
[src]
/ 2
| 3*x 2
| (2*(x*log(x) - x) + 2) dx = C + 2*x - ---- + x *log(x)
| 2
/
∫(2(xlog(x)−x)+2)dx=C+x2log(x)−23x2+2x
The graph
Use the examples entering the upper and lower limits of integration.