Hey mathDad.
Are you trying to integrate this function? If so try the substitution u = x-1 and then simplify this integral to get a set of x^n type expressions which are easy to integrate.
Typically, if the numerator's degree is more than the denominator, I think you do polynomial division, first (right?). But what if that is not convenient (or if we're just too lazy to distribute). Say, for example you want to partial fraction decompose:
I could FOIL the bottom, but we want to find if there is another way to do this. We tried
.
But, there are no terms on the right and so it ends up with A, B, and C all equal to 0 (not surprisingly).
So is the only way to do this to expand the bottom? What if we had to do partial fractions on (or bigger)? How do you partially fraction decompose that (sans a CAS)?
Hey mathDad.
Are you trying to integrate this function? If so try the substitution u = x-1 and then simplify this integral to get a set of x^n type expressions which are easy to integrate.
If you were to carry out the division, you would get an x term, a constant term, and a remainder which would be (in general) a quadratic divided by (x-1)^3.
The usual rules for partial fractions are only needed for the remainder (fraction) part.
So, assume that
(In this particular case, we can see by inspection that A=1.)
With the x^9 case, the assumed expansion would be