Example 1 Divide \( x^3 + 3x^3 + 2x + 1 \) by \( x+2 \). Example 2 Perform a long division: \( (4x^4-6x^3+2x^2-3x+5) \div (2x+1) \).
Author Archives: iitutor
Differentiation and Displacement, Velocity and Acceleration
Distance Distance is the magnitude of the total movement from the start point or a fixed point. For example, a particle moves \( 5 \) units forwards from \( O \), and moves \( 3 \) backwards. Its distance travelled is \( 5 + 3= 8 \) units. Displacement The displacement of a moving position […]
Probability with Wins Draws and Loses in Go Matches
In a Go match between the Amy team and Ben team, a game is played on each of board \( 1 \), board \( 2 \), board \( 3 \) and board \( 4 \). On each board, the probability that the Amy team wins is \( 0.2 \), the probability of a draw is […]
Calculating Chi-Squared
\( 2 \times 2 \) Contingency Table The following shows the results of a survey of a sample of \( 200 \) randomly chosen adults classified according to gender and sport. These are called observed values or observed frequencies. $$ \begin{array}{|c|c|c|c|} \hline & \text{loves sport} & \text{hates sport} & \text{sum} \\ \hline \text{male} & 72 […]
Drawing Venn Diagrams Effectively
Consider the following situation to illustrate through Venn diagrams. Two Circles There are \( 50 \) students in a certain high school. \( 16 \) study Physics, \( 13 \) study Chemistry, and \( 15 \) study both Physics and Chemistry. Illustrate this information on a Venn diagram. $$ \begin{align} a+b+c+d &= 50 \text{ total […]
Mathematics Glossary
ABCDEFGHIJKLMNOPQRSTUVWXYZA Absolute error - The difference between the actual value and the measured value indicated by an instrument. Accessibility sampling - Selecting a sample from onlythose items that we most readily available. Acount servicing fee - Ongoing account keeping fees. Actual interest rate - Represents the actual oercentage return per year on an investment (the [...]
Rewrite Expressions in Sine and Cosine involving Powers of Cosine or Sine by Complex Number
Let \( z = \cos \theta + i \sin \theta \). (a) By considering the real part of \( z^4 \), prove \( \cos 4\theta = \cos^4 \theta - 6 \cos^2 \theta \sin^2 \theta + \sin^4 \theta \). \( \begin{align} \displaystyle \require{color} z &= \cos \theta + i \sin \theta \\ z^4 &= (\cos [...]
Adding Multiples of Consecutive Odd Numbers by Mathematical Induction
(a) Factorise \( 4x^3 + 18x^2 + 23x + 9 \). \( \begin{align} \displaystyle 4x^3 + 18x^2 + 23x + 9 &= 4x^3 + 4x^2 + 14x^2 + 23x + 9 \\ &= 4x^2 (x+1) + 14x^2 + 14x + 9x + 9 \\ &= 4x^2 (x+1) + 14x(x+1) + 9(x+1) \\ &= (x+1)(4x^2 [...]
Mathematical Induction Regarding Factorials
Prove by mathematical induction that for al lintegers \( n \ge 1 \) , $$ \dfrac{1}{2!} + \dfrac{2}{3!} + \dfrac{3}{4!} + \cdots + \dfrac{n}{(n+1)!} = 1 - \dfrac{1}{(n+1)!}$$ Step 1: Show it is true for \( n=1 \). \( \begin{align} \displaystyle \text{LHS } &= \dfrac{1}{2!} = \dfrac{1}{2} \\ \text{RHS } &= 1 - \dfrac{1}{2!} \\ [...]
Applications of the Unit Circle
The identify $\cos^2 \theta + \sin^2 \theta = 1$ is required for finding trigonometric ratios. Example 1 Find exactly the possible values of $\cos \theta$ for $\sin \theta = \dfrac{5}{8}$. \( \begin{align} \displaystyle \cos^2 \theta + \sin^2 \theta &= 1 \\ \cos^2 \theta + \sin^2 \dfrac{5}{8} &= 1 \\ \cos^2 \theta + \dfrac{25}{64} &= 1 [...]