Date | November 2016 | Marks available | 5 | Reference code | 16N.2.hl.TZ0.4 |
Level | HL only | Paper | 2 | Time zone | TZ0 |
Command term | Find | Question number | 4 | Adapted from | N/A |
Question
Find the constant term in the expansion of \({\left( {4{x^2} - \frac{3}{{2x}}} \right)^{12}}\).
Markscheme
attempting a valid method to obtain the required term in the expansion (M1)
Note: Valid methods include an attempt to expand, noting the behaviour of the powers of \(x\), use of the general binomial expansion term, use of a ratio etc.
identifying the correct term (A1)
\(\left( {\begin{array}{*{20}{c}} {12} \\ 8 \end{array}} \right) \times {4^4} \times {\left( { - \frac{3}{2}} \right)^8}{\text{ }}\left( { = 495 \times {4^4} \times {{\left( { - \frac{3}{2}} \right)}^8}} \right)\) M1A1
Note: Accept \(\left( {\begin{array}{*{20}{c}} {12} \\ 4 \end{array}} \right)\).
Note: Award M1 for the product of a binomial coefficient, a power of 4 and either a power of \( - \frac{3}{2}\) or \(\frac{3}{2}\).
\( = 3\,247\,695\) A1
[5 marks]