((–1x^2–2x–14)/(x+5)(x^2+4)) = ((A)/(x+5)) + ((Bx+C)/(x^2+4))
Now evaluate the indefinite integral.
*int* ((–1x^2–2x–14)/((x+5)(x^2+4))dx
If you can give me the answer to the integral as well as A,B,and C please?!
The form of the partial fraction decomposition of a rational function is given below...find A, B, and C?
A(x^2 + 4) + (Bx + C)(x + 5) = - x^2 - 2x -14
Putting x = - 5:
29A = - 25 + 10 - 14
A = - 1
Equating absolute terms:
- 4 + 5C = - 14
C = - 2
Equating coefficients of x:
- 2 + 5B = - 2
B = 0
int[ (–1x^2–2x–14)/((x+5)(x^2+4))dx
= int[ - 1 / (x + 5) - 2 / (x^2 + 4) ] dx
= - ln | x + 5 | - arctan(x / 2) + c.
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