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'Exploring Quadratic Mappings' printed from http://nrich.maths.org/
Preveina from Crest Girls' Academy made the
When I put the input as 0, I perceived that that the output is the
product of the numbers that I have replaced. For example, for the
initial values of 1 and 3, when the input was 0 the output was 3.
When I changed the values in the mapping to 8 and 5, the input of 0
gave an output of 40.
from Fair Field Junior School sent us his explorations with
quadratic mappings, which you can read here.