Question

Evaluate the given definite integral using the fundamental theorem of calculus.

14(x1)3/2xdx\int_1^4 \frac{(\sqrt{x}-1)^{3 / 2}}{\sqrt{x}} d x

Solution

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Answered 1 year ago
Answered 1 year ago
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Let f(x)=(x1)3/2xf(x)=\dfrac{(\sqrt{x}-1)^{3/2}}{\sqrt{x}}.

We shall compute the given definite integral using the method of substitution.

Substitute u=x1u=\sqrt{x}-1. Then,

  1. du=12x dxdu=\dfrac{1}{2\sqrt{x}}\ dx which implies 1x dx=2 du\dfrac{1}{\sqrt{x}}\ dx=2\ du
  2. When x=1,u=11=11=0x=1, u=\sqrt{1}-1=1-1=0.
  3. When x=4,u=41=21=1x=4, u=\sqrt{4}-1=2-1=1.

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