A Level Maths
Demo
A Level
Polynomial Division
1. Given that $$2x^3-7x^2+13+c$$ can be written as $(2x-3)(x^2+ax+b)$, find $a$, $b$ and $c$
$a = -2$, $b = -3$, $c = -4$
2. Given that $2x-1$ is a factor of the denominator, fully simplify $$\dfrac{4x^2+16x}{2x^3+3x^2-18x+8}$$
$\dfrac{4x}{(2x-1)(x-2)}$
3. Given that $2x+1$ is a factor of the numerator, fully simplify $$\dfrac{4x^3-7x-3}{2x^2+3x+1}$$
$2x-3$
4. Given that $5x-2$ is a factor of the denominator, fully simplify $$\dfrac{15x^2-6x}{15x^3+19x^2-4}$$
$\dfrac{3x}{(x+1)(3x+2)}$
5. Given that $3x+1$ is a factor of the denominator, fully simplify $$\dfrac{9x^3+21x^2+6x}{9x^3+18x^2-x-2}$$
$\dfrac{3x}{3x-1}$
6. When $$3x^3+2x^2-7x+d$$ is divided by $3x-1$, the remainder is $-1$. Find $d$.
$1$
7. Write $$\dfrac{2x^3-x^2+2x-2}{2x-1}$$ in the form $x^2+a+\dfrac{b}{2x-1}$
$a = 1$, $b = -1$
8. Given that $(2x+1)$ is a factor of $$6x^3-19x^2+9x+10$$ fully factorise it.
$(2x+1)(x-2)(3x-5)$
9. Given that $2x-3$ is a factor of the denominator, fully simplify $$\dfrac{2x^2+x-6}{4x^3-13x+6}$$
$\dfrac{1}{2x-1}$
10. Determine whether any of: $(x-2)$, $(x-4)$ or $(x-6)$ are factors of $$x^3-3x^2+6x-40$$
$(x-4)$
11. Use polynomial division to simplify $$\dfrac{x^3+4x^2+7x+6}{x+2}$$
$x^2+2x+3$
12. Given that $x-a$ is a factor of $$x^3+x^2-x+a$$ find the possible values of $a$.
$-1, 0$
13. The remainder when $$ax^3 - 32x^2 - 10x + 12$$ is divided by $x-2$ is the same as when it is divided by $2x+3$. Find $a$.
$a = 8$
14. One solution to the equation $$3x^3-2x^2-12x+8=0$$ is $x=2$. Find the other solutions.
$x = -2, \frac{2}{3}$
15. Given that $x = -3$ is a solution of the equation $$2x^3+3x^2-8x+a$$ find two other solutions to the equation.
$a = 3$, $x = 0.5, 1$
16. The graph of $$y = 2x^3-7x^2-2x+1$$ crosses the $x$ axis at $x=-0.5$. Find the exact values of any other intersections with the $x$ axis.
$x = 2\pm\sqrt{3}$
17. The graph of $$y = 6x^3-7x^2-x+2$$ crosses the $x$ axis at $x=1$. Find the exact values of any other intersections with the $x$ axis.
$x = -\frac{1}{2},\frac{2}{3}$
18. Show that the graph of $$y=2x^3+x^2+8x+4$$ crosses the $x$ axis only once, at $x = -0.5$.
Remainder after division by $2x+1$ is $x^2+4$, discrinimant less than zero.