x
y
-3
10
-2
5
-1
2
-0.5
1.25
0
1
0.5
1.25
1
2
2
5
3
There are many points on the graph which do not
appear in the table. For each of them, if you square
the x coordinate and add 1, it gives the y coordinate.
© MEI 2009
Teachers’ notes
This starter can be used in a lesson on calculating points on a quadratic graph
or as part of a lesson on correct use of a calculator – it isn’t always easier to use
a calculator.
• Students need to have used equations of
graphs before doing this starter.
• Students often go wrong with squaring
negative numbers. Some calculators will
give -8 as the answer to
(-)
3
x²
+
© MEI 2009
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