Mathematics 9709 · AS & A Level · Algebra

Algebra — practice question

(i)[5]

The polynomial $x^3 + ax^2 + bx + 8$, in which $a$ and $b$ are constants, is represented by $p(x)$. It is given that when $p(x)$ is divided by $(x - 3)$ the remainder is $14$, and that when $p(x)$ is divided by $(x + 2)$ the remainder is $24$. Find the values of $a$ and $b$.

(ii)[4]

When $a$ and $b$ take these values, find the quotient when $p(x)$ is divided by $x^2 + 2x - 8$ and hence solve the equation $p(x) = 0$.

Worked solution & mark scheme

This 9-mark question has a full step-by-step worked solution and mark scheme. One marking point: Substitute $x = 3$ and set equal to $14$ to obtain $9a + 3b + 35 = 14$

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