Based on your observation for Category 3 graphs in your worksheet, at which values do you think these graphs will cut the x-axis?
a) y=x(x-4)
b) y=2x(x-3)
What has the equation of the graph y=x(x-4) got to do with the solving of the equation x(x-4)=0? How does this link to the values which the graph cuts at the x-axis?
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