Question

(2x - 1)3 dx
integration of this ex​

Answer 1

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=(2x-1)3dx

=6(x-1).(x+1)3

=6x-6.6x+6.3

=36x-36.36x+36

=36x. 36

=square root of 36

=6

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Answer 2

Answer:

Let T=∫ex(x2+1)(x+1)2dx=∫ex((x+1)2−2x)(x+1)2dx=∫ex((x+1)2−2(x+1)+2)(x+1)2dx=∫ex(x+1)2(x+1)2dx−2∫ex(x+1)(x+1)2dx+2∫ex(x+1)2dx=∫exdx−2∫exx+1dx+2∫ex(x+1)2dx=ex−2(∫exx+1dx−∫ex(x+1)2dx)

We use integration by parts on the first of these integrals, which uses the following general rule: ∫udv=uv−∫vdu. So let u=1x+1 and v=ex.

∴∫exx+1dx=exx+1+∫ex(x+1)2dx

∴T=ex−2(exx+1+∫ex(x+1)2dx−∫ex(x+1)2dx)=ex−2exx+1=ex(x+1)−2exx+1=ex(x−1)x+1+C

Small print: • when I use log this denotes natural logarithm (base e); if any other base is intended it’ll be shown as a subscript • I generally omit constants of integration from indefinite integrals until showing a final or intermediate result •