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When writing a balanced chemical equation of the combustion of Ethanol, should it be written as CH3CH2OH or C2H5OH ?

Answer says D; just wondering if anyone can explain it for me.

The polynomial P(x) = x^3 + px^2 + qx + r = 0 has roots sqrt(k), -sqrt(k), and a. 1. Explain why a + p = 0 2. Show that ka = r 3. Show that pq = r Source: Question 4 (c) http://www.boardofstudies.nsw.edu.au/hsc_exams/hsc2000exams/hsc00_maths/00mathematics34U.pdf

Solve: 3cos theta - 4sin theta = 5 for -pi <= theta <= pi