OCR MEI C1 — Question 7 5 marks

Exam BoardOCR MEI
ModuleC1 (Core Mathematics 1)
Marks5
PaperDownload PDF ↗
Mark schemeDownload PDF ↗
TopicFactor & Remainder Theorem
TypePolynomial with equal remainders
DifficultyModerate -0.3 This is a straightforward application of the Remainder Theorem requiring two substitutions and solving a simple linear equation. While it involves connecting two polynomial divisions, the algebraic manipulation is routine and the problem structure is standard for C1 level, making it slightly easier than average.
Spec1.02j Manipulate polynomials: expanding, factorising, division, factor theorem

7 The remainder when \(x ^ { 3 } - 2 x + 4\) is divided by ( \(x - 2\) ) is twice the remainder when \(x ^ { 2 } + x + k\) is divided by ( \(x + 1\) ).
Find the value of \(k\).

AnswerMarks
\(f(2) = 8 - 4 + 4 = 8\)M1, A1
\(g(-1) = k\)
AnswerMarks
\(\Rightarrow k = 4\)M1, A1, A1
$f(2) = 8 - 4 + 4 = 8$ | M1, A1 | 

$g(-1) = k$

$\Rightarrow k = 4$ | M1, A1, A1 |
7 The remainder when $x ^ { 3 } - 2 x + 4$ is divided by ( $x - 2$ ) is twice the remainder when $x ^ { 2 } + x + k$ is divided by ( $x + 1$ ).\\
Find the value of $k$.

\hfill \mbox{\textit{OCR MEI C1  Q7 [5]}}