# E-Maths Note: Quadratic Equations & Graphs Series

For those in Sec 3s, you will be learning more about Quadratic Graphs. Not so much of the drawing like in Sec 2s, but more of indepth understanding.

A quadratic graph typically is either a smiley face :) or a sad face :( some prefer to call them U or n shape.

Q1: Do you know how to tell the "mood" of the quadratic graph given its equation? Be very speific to ensure crystal clear understanding.

Eg $y=-3+x-2x^2$ :) or :(

Here are some important features of a quadratic graphs

1. $x-intercepts aka the roots$
2. $y-intercept$
3. the turning point, either a max or a min point
4. Equation of line of symmetry

Q2: Do you know that given a sketch of a quadratic graph with the x-intercepts indicated clearly, you can find

1. the equation of the graph
2. the equation of line of symmetry
3. the co-ordinates of the turning point

By the way, co-ordinate is often referred to the "address" of a particular point. It looks like this : (x,y)

### Related Post

A-Math: Quadratic Equation & Discriminant (Plus Common Mistakes & Counter Measures) Commonly asked in school and 'O' Level Examinations, many students also commit to commonly made mistakes. Watch the video (5 minutes) and see how you ...
E-Maths Note: Quadratic Equations & Graphs 3 Different representations of a quadratic equation & its significance y=3x^2 - x + 5 : typical quadratic equation : Max/Min & instant answer...
Protected: Video Solution: GCE O Level 2008 Additional Mathematics Quadratic Equations (Subscribe an... Video Solution 1: GCE O Level 2008 Additional Mathematics Quadratic Equations Video Solution 2: GCE O Level 2008 Additional Mathematics Quadratic E...
'O' levels & Sec 3 Math & Chemistry Holiday Programmes 2010 (Revision & Headstart) UPDATE: Early Bird registration is extended to 6 Dec 09, 2359 hours (Singapore time) Credit: Art Institute of Portland Most Secondary two st...
A-Maths: Find Equation of Circle Given Tangent & Circle + More           Many students after reading the question take a long time to begin as they don't know how to sta...

### Ai Ling Ong

Hi, I'm Ai Ling Ong. I enjoy coaching students who have challenges with understanding and scoring in 'O' Level A-Maths and E-Maths. I develop Math strategies, sometimes ridiculous ideas to help students in understanding abstract concepts the fast and memorable way. I write this blog to share with you the stuff I teach in my class, the common mistakes my students made, the 'way' to think, analyze... If you have found this blog post useful, please share it with your friends. I will really appreciate it! :)

### 2 Responses to E-Maths Note: Quadratic Equations & Graphs Series

1. [...] Strategies. Thanks for visiting!I have discussed about Quadratic Equations and Graphs previously in Features of Quadratic Equations and Graphs , Different representations of quadratic equations and their [...]

2. [...] Individual O Level Math Coaching FULL :)O Level Exams TimetableACS(I) among world's best in IB examsE-Maths Note: Quadratic Equations & Graphs SeriesAlgebraic Expansion Golden Rules : Art of Application I Am Really Excited About This Online MindMap [...]