Sketching a Quadratic Graph

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o sketch a graph we need to find a set of points. This is most easily done by drawing up a table. The table for the graph given by the equation

-3

-2

-1

0

1

2

3

9

4

1

0

1

4

9

3

2

1

0

-1

-2

-3

1

1

1

1

1

1

1

13

7

3

1

1

3

7

When filling in the table the most important thing to remember is that when you square a minus number you obtain a positive number, egnot -9.

DO NOT RELY ON YOUR CALCULATOR TO WORK OUT THE SQUARE OF A MINUS NUMBER.

Your calculator will tell you thatwhich is exactly wrong:is correct. The graph is shown below.

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