Inactive Tutor answered 04/18/13
Do you want to do partial fraction of (v^2+12)/(v^2-6v-27) ?
Here you go!
(v^2+12)/(v^2-6v-27)
= (v^2-6v-27+6v+27+12)/(v^2-6v-27)
= 1 + (6v+39)/(v^2-6v-27)
= 1 + (6v+39)/[(v-9)(v+3)]
= 1 + A/(v-9) + B/(v+3)
6v+9 = A(v+3) + B(v-9)
Let v = 9, 54+9 = 27A => A = 7/3
Let v = -3, -18+9 = -12B => B = 3/4
Answer: (v^2+12)/(v^2-6v-27) = 1 + (7/3)/(x+3) + (3/4)/(x-9)