From my understanding, I have to always factorize the denominator of the fraction to one of these 3 formulas to proceed on:
3. where cannot be factored into linear factors (omg i haven't touch on this yet)
However I tried and failed to factorize the denominator to substitute to any of the formulas above.
Please enlighten me! I just need to change them into one of the stated formula and I can to solve it further by myself. Your every effort is appreciated.. Thank you.