While expressing x2+x+14x3−x2+6 into partial fractions, what must be done immediately after noticing that deg numerator ≥deg denominator?
a) Factorise the denominator into linear factors.
b) Assume a form x2+x+1Ax+B directly and equate coefficients.
c) Perform polynomial long division to write the fraction as a polynomial plus a proper fraction.
d) Complete the square in the denominator.