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Integrate int(dx)/(7x^(2)+8)

Integrate dx7x2+8 \int \frac{d x}{7 x^{2}+8} =

Full solution

Q. Integrate dx7x2+8 \int \frac{d x}{7 x^{2}+8} =
  1. Identify Integral: Identify the integral that needs to be solved.\newlineWe need to find the indefinite integral of the function 17x2+8\frac{1}{7x^2+8} with respect to xx.
  2. Recognize Form: Recognize the form of the integral. The integral is of the form dxax2+b\int \frac{dx}{ax^2+b}, which suggests a trigonometric substitution or a direct comparison to the standard integral form dxx2+a2\int \frac{dx}{x^2+a^2}, which results in 1a\frac{1}{a}arctanxa\frac{x}{a} + CC.
  3. Perform Substitution: Perform a substitution to match the standard form.\newlineLet's compare 7x2+87x^2+8 to the standard form x2+a2x^2+a^2. We can rewrite the integral as dx7(x2+(8/7))\int \frac{dx}{7(x^2+(8/7))}.
  4. Factor Out Constant: Factor out the constant from the denominator.\newlineWe can factor out the 77 from the denominator to match the standard form. The integral becomes (1/7)dx/(x2+(8/7))(1/7)\int dx/(x^2+(8/7)).
  5. Complete Square: Complete the square in the denominator.\newlineTo complete the square, we need to have a perfect square in the denominator. We already have that since (87)(\frac{8}{7}) is a constant term. So, we can write the integral as (17)dxx2+(87)2(\frac{1}{7})\int \frac{dx}{x^2+(\sqrt{\frac{8}{7}})^2}.
  6. Apply Standard Form: Apply the standard integral form.\newlineNow we can apply the standard integral form dxx2+a2=1aarctan(xa)+C\int \frac{dx}{x^2 + a^2} = \frac{1}{a}\text{arctan}\left(\frac{x}{a}\right) + C. Here, a=87a = \sqrt{\frac{8}{7}}, so the integral becomes 187arctan(x87)+C\frac{1}{\sqrt{\frac{8}{7}}}\text{arctan}\left(\frac{x}{\sqrt{\frac{8}{7}}}\right) + C.
  7. Simplify Expression: Simplify the expression.\newlineSimplify the expression to get the final answer. We have (187)arctan(x87)+C=(78)arctan(x78)+C(\frac{1}{\sqrt{\frac{8}{7}}})\arctan(\frac{x}{\sqrt{\frac{8}{7}}}) + C = (\sqrt{\frac{7}{8}})\arctan(x\sqrt{\frac{7}{8}}) + C.