Question:

\( \int \left( \frac{1}{7} - 6x - x^2 \right) \, dx \)

Updated On: Jun 26, 2024
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Approach Solution - 1

1/8 log{7+x/1-x}+c

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Approach Solution -2

To integrate \( \int \left( \frac{1}{7} - 6x - x^2 \right) \, dx \), we will integrate each term separately.
1. Integrate \( \frac{1}{7} \) with respect to \( x \):
  \[ \int \frac{1}{7} \, dx = \frac{1}{7}x \]
2. Integrate \( -6x \) with respect to \( x \):
  \[ \int -6x \, dx = -\frac{6}{2}x^2 = -3x^2 \]
3. Integrate \( -x^2 \) with respect to \( x \):
  \[ \int -x^2 \, dx = -\frac{1}{3}x^3 \]
Now, combine all these results to find the definite integral:
\[ \int \left( \frac{1}{7} - 6x - x^2 \right) \, dx = \frac{1}{7}x - 3x^2 - \frac{1}{3}x^3 + C \]
where \( C \) is the constant of integration.
So, the evaluated integral \( \int \left( \frac{1}{7} - 6x - x^2 \right) \, dx \) is \( \frac{1}{7}x - 3x^2 - \frac{1}{3}x^3 + C \).
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Concepts Used:

Methods of Integration

Given below is the list of the different methods of integration that are useful in simplifying integration problems:

Integration by Parts:

 If f(x) and g(x) are two functions and their product is to be integrated, then the formula to integrate f(x).g(x) using by parts method is:

∫f(x).g(x) dx = f(x) ∫g(x) dx − ∫(f′(x) [ ∫g(x) dx)]dx + C

Here f(x) is the first function and g(x) is the second function.

Method of Integration Using Partial Fractions:

The formula to integrate rational functions of the form f(x)/g(x) is:

∫[f(x)/g(x)]dx = ∫[p(x)/q(x)]dx + ∫[r(x)/s(x)]dx

where

f(x)/g(x) = p(x)/q(x) + r(x)/s(x) and

g(x) = q(x).s(x)

Integration by Substitution Method

Hence the formula for integration using the substitution method becomes:

∫g(f(x)) dx = ∫g(u)/h(u) du

Integration by Decomposition

Reverse Chain Rule

This method of integration is used when the integration is of the form ∫g'(f(x)) f'(x) dx. In this case, the integral is given by,

∫g'(f(x)) f'(x) dx = g(f(x)) + C

Integration Using Trigonometric Identities