1. Quadratic Graphs y = x2 + 2x - 2
Remember that -2 in the equation is the intercept so it will run through x -3 -2 -1 1 2 x2 2x y

2. Now let’s multiply each value of x by 2 to find the values of 2x
Quadratic Graphs
Note: - X - = +
So -22 = -2 X -2 = 4
Use it to find the values of x2
y = x2 + 2x - 2 x -3 -2 -1 1 2 x2 2x y 9 4 1 1 4 -6 -4 -2 2 4
Now let’s multiply each value of x by 2 to find the values of 2x
+ X - = -
so 2 X -3 =-6

3. Quadratic Graphs y = x2 + 2x - 2
To find the values of y, we must sum all the values of x2, 2x and -2.
Be careful with the negative signs. x -3 -2 -1 1 2 x2 9 4 2x -6 -4 y 1 -2 -3 -2 1 6

4. Quadratic Graphs y = x2 + 2x - 2 x -3 -2 -1 1 2 x2 9 4 2x -6 -4 y 61 2 x2 9 4 2x -6 -4 y 6
y = x2 + 2x - 2
Plot the values of x and y on the grid and join the points with smooth curve.

5. Quadratic Graphs More negative values
y = x2 – 3x - 2 x -1 1 2 3 4 x2
-3x -2 y
Remember that -2 in the equation is the intercept so it will run through
Note: - X - = +
So -12 = -1 X -1 = 1
Use it to find the values of x2. These are just the ordinary square numbers.

6. Quadratic Graphs More negative values
y = x2 – 3x - 2 x -1 1 2 3 4 x2 9 16
-3x -2 y
Multiply each value of x by -3.
- X - = +
- X + = - 3 -3 -6 -9
-12 2 -2 -4 -4 -2 2
To find the values of y, we must sum all the values of x2, 2x and -2.
Be careful with negative signs. .

7. Quadratic Graphs More negative values
y = x2 – 3x - 2 x -1 1 2 3 4 x2 9 16
-3x -3 -6 -9
-12 -2 y -4
y = x2 – 3x - 2
Plot the values of x and y on the grid and join the points with smooth curve