**Integration of Rational Function With Square Root in Denominator :**

Here we are going to see some example problems to understand integration of rational function with square root in denominator

To know the formulas used in integration, please visit the page "Integration Formulas for Class 12".

**Question 1 :**

Evaluate the following with respect to "x".

(x + 2) / √(x^{2} - 1)

**Solution :**

(x + 2) / √(x^{2} - 1) = **∫**(x/√(x^{2} - 1)) dx + 2**∫(1**/√(x^{2} - 1)) dx

**∫**(x/√(x^{2} - 1)) dx

x^{2} - 1 = t

2x dx = dt

x dx = dt/2

**∫**(x/√(x^{2} - 1)) dx = **∫(1/**√t) dt

= **∫**t^{-1/2} (dt/2)

= (1/2) t^{1/2}/(1/2)

= √(x^{2} - 1) ---(1)

**2∫(1**/√(x^{2} - 1)) dx = 2 log(x + √(x^{2} - 1)) ------(2)

(1) + (2)

= √(x^{2} - 1) + 2 log(x + √(x^{2} - 1)) + c

**Question 2 :**

Evaluate the following with respect to "x".

(2x + 3) / √(x^{2 }+ 4x + 1)

**Solution :**

∫(2x + 3) / √(x^{2 }+ 4x + 1) dx

(2x + 3) = A(d/dx) (x^{2 }+ 4x + 1) + B

2x + 3 = A (2x + 4) + B ----(1)

Equating the coefficients of x.

2 = 2A

A = 1

Equating constant terms

3 = 4A + B

3 = 4(1) + B

3 = 4 + B

B = 3 - 4 ===> B = -1

Applying the values of A and B in (1)

2x + 3 = 1 (2x + 4) - 1

By dividing each term by √(x^{2 }+ 4x + 1), we get

∫(2x + 1) / √(x^{2 }+ 4x + 1) dx

= ∫(2x+4)/√(x^{2 }+ 4x + 1) dx - 1 ∫1/√(x^{2 }+ 4x + 1)dx

= 2 log √(x^{2 }+ 4x + 1) - 1 ∫1/√(x^{2 }+ 4x + 1)dx

√(x^{2 }+ 4x + 1) = [x^{2 }+ 2x(2) + 2^{2} - 2^{2} + 1]

= [(x + 2)^{2 }- 3]

= [(x + 2)^{2 }- √3^{2}]

= 2 log √(x^{2 }+ 4x + 1) - 1 ∫1/√[(x + 2)^{2 }- √3^{2}] dx

= 2 log √(x^{2 }+ 4x + 1) - log (x + 2) + √(x^{2 }+ 4x + 1) + c

- Indefinite Integral Using Properties
- Integration of Rational Functions with Quadratic Denominator
- Integration of Rational Functions With Square Roots
- Integration of Linear in Numerator and Quadratic in the Denominator
- How to Integrate a Rational Function Linear in the Numerator
- Integration of Rational Function With Square Root in Denominator

After having gone through the stuff given above, we hope that the students would have understood, "Integration of Rational Function With Square Root in Denominator"

Apart from the stuff given in "Integration of Rational Function With Square Root in Denominator", if you need any other stuff in math, please use our google custom search here.

HTML Comment Box is loading comments...

You can also visit the following web pages on different stuff in math.

**WORD PROBLEMS**

**Word problems on simple equations **

**Word problems on linear equations **

**Word problems on quadratic equations**

**Area and perimeter word problems**

**Word problems on direct variation and inverse variation **

**Word problems on comparing rates**

**Converting customary units word problems **

**Converting metric units word problems**

**Word problems on simple interest**

**Word problems on compound interest**

**Word problems on types of angles **

**Complementary and supplementary angles word problems**

**Trigonometry word problems**

**Markup and markdown word problems **

**Word problems on mixed fractrions**

**One step equation word problems**

**Linear inequalities word problems**

**Ratio and proportion word problems**

**Word problems on sets and venn diagrams**

**Pythagorean theorem word problems**

**Percent of a number word problems**

**Word problems on constant speed**

**Word problems on average speed **

**Word problems on sum of the angles of a triangle is 180 degree**

**OTHER TOPICS **

**Time, speed and distance shortcuts**

**Ratio and proportion shortcuts**

**Domain and range of rational functions**

**Domain and range of rational functions with holes**

**Graphing rational functions with holes**

**Converting repeating decimals in to fractions**

**Decimal representation of rational numbers**

**Finding square root using long division**

**L.C.M method to solve time and work problems**

**Translating the word problems in to algebraic expressions**

**Remainder when 2 power 256 is divided by 17**

**Remainder when 17 power 23 is divided by 16**

**Sum of all three digit numbers divisible by 6**

**Sum of all three digit numbers divisible by 7**

**Sum of all three digit numbers divisible by 8**

**Sum of all three digit numbers formed using 1, 3, 4**

**Sum of all three four digit numbers formed with non zero digits**