Moderate -0.8 This is a straightforward completing the square question with a non-unit coefficient. It requires factoring out the 3, completing the square on the resulting expression, and expanding to find p, q, and r. This is a standard C1 technique with minimal steps and no problem-solving required, making it easier than average.
If \(p, q, r\) found correctly, then ISW slips in format. See guidance for various acceptable forms of final answer.
$3(x^2 - 6x) + 4 = 3[(x-3)^2 - 9] + 4 = 3(x-3)^2 - 23$ | B1, B1, M1, A1 | If $p, q, r$ found correctly, then ISW slips in format. See guidance for various acceptable forms of final answer.