Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
9 Cards in this Set
- Front
- Back
|
What is the discriminant? |
b² - 4ac |
|
|
What does the discriminant show us? |
How many times the parabola crosses the x axis. |
|
|
What does it mean if b² - 4ac is less than 0 ? |
There are no real roots and the parabola is above or below the x acis but doesn't cross it. |
|
|
What does it mean if b² - 4ac = 0 ? |
There is one repeated root so the parabola hits the x axis and bounces off. |
|
|
What does it mean if b² - 4ac is more than 0 ? |
There are two real roots and the parabola crosses the x axis at two points. |
|
|
How do we know if the graph is a u or n shape? |
If the x² coefficient is positive, it is a u shape, if it's negative, it's an n shape. |
|
|
How do you find the y intercept? |
Look at the number for c. |
|
|
How do you find where it crosses the x axis? |
Factorise |
|
|
How do you find the vertex of the parabola? |
Complete the square and use the whole numbers as co-ordinates. Change the sign of the number in brackets |
