Easy -1.2 This is a straightforward binomial expansion with a small positive integer power (n=4), requiring only direct application of the binomial theorem formula or Pascal's triangle. It's a routine C2 exercise with no problem-solving element—just mechanical expansion and simplification of coefficients.
$1 - 8x + 24x^2 - 32x^3 + 16x^4$ | B1 | For first two terms $1 - 8x$
| M1 | For expansion in powers of $(-2x)$
| M1 | For any correct use of binomial coefficients
| A1 | For any one further term correct
| A1 | 5 | For completely correct expansion