The partial fractions of frac{x^4 + 24x^2 + 2 | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(A) Let $\frac{x^4 + 24x^2 + 28}{(x^2 + 1)^3} = \frac{A_1 x + B_1}{x^2 + 1} + \frac{A_2 x + B_2}{(x^2 + 1)^2} + \frac{A_3 x + B_3}{(x^2 + 1)^3}$.Then,

Vedclass · Accepted Answer

$\frac{1}{x^2 + 1} + \frac{22}{(x^2 + 1)^2} + \frac{5}{(x^2 + 1)^3}$

Vedclass · Answer

(A) Let $\frac{x^4 + 24x^2 + 28}{(x^2 + 1)^3} = \frac{A_1 x + B_1}{x^2 + 1} + \frac{A_2 x + B_2}{(x^2 + 1)^2} + \frac{A_3 x + B_3}{(x^2 + 1)^3}$.Then,$x^4 + 24x^2 + 28 = (A_1 x + B_1)(x^2 + 1)^2 + (A_2 x + B_2)(x^2 + 1) + (A_3 x + B_3)$.Let $x^2 = y$. Then $\frac{y^2 + 24y + 28}{(y + 1)^3} = \frac{A}{y + 1} + \frac{B}{(y + 1)^2} + \frac{C}{(y + 1)^3}$.Let $y + 1 = t$,so $y = t - 1$. Then $y^2 + 24y + 28 = (t - 1)^2 + 24(t - 1) + 28 = t^2 - 2t + 1 + 24t - 24 + 28 = t^2 + 22t + 5$.Thus,$\frac{t^2 + 22t + 5}{t^3} = \frac{1}{t} + \frac{22}{t^2} + \frac{5}{t^3}$.Substituting $t = x^2 + 1$,we get $\frac{1}{x^2 + 1} + \frac{22}{(x^2 + 1)^2} + \frac{5}{(x^2 + 1)^3}$.

The partial fractions of $\frac{x^4 + 24x^2 + 28}{(x^2 + 1)^3}$ are

Similar Questions

If the expansion in powers of $x$ of the function $\frac{1}{(1 - ax)(1 - bx)}$ is $a_0 + a_1x + a_2x^2 + a_3x^3 + \dots$,then $a_n$ is

If $\frac{3x + 4}{{(x + 1)}^2(x - 1)} = \frac{A}{x - 1} + \frac{B}{x + 1} + \frac{C}{{(x + 1)}^2}$,then $A = $

If $\frac{ax^2 + bx + c}{(x - 1)(x + 2)(2x + 3)} = \frac{3}{x - 1} + \frac{2}{x + 2} - \frac{5}{2x + 3}$,then:

If $\frac{x^4}{(x-1)(x-2)(x-3)}=Ax+B \cdot \frac{1}{x-1}+C \cdot \frac{1}{x-2}+D \cdot \frac{1}{x-3}+E$,then $A+B+C+D+E=$

Let $x$ be a real number and $-2 < x < 2$. When $\frac{x+1}{(x+3)(x-2)}$ is expanded in powers of $x$,then the coefficient of $x^3$ is

Vedclass Test Series

Exam Paper Generator

Online Exam Module